研究者詳細 - 小田　勝

論文 - 小田　勝

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Room-Temperature Strong Coupling of Hexane-Dispersed Colloidal CdSe Nanoplatelets in a Microcavity Composed of Two Bragg Reflectors 査読有り国際誌

Oda M., Yamato K., Egashira J., Kondo H.

Journal of Physical Chemistry C 2025年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

CdSe nanoplatelets (NPLs) are suitable for exploring strong light-matter coupling in semiconductor nanocrystal systems due to their giant oscillator strength and large exciton binding energy. Here, we report the facile fabrication and optical characterization of a λ/2 planar microcavity, which consists of two distributed Bragg reflectors with a hexane layer containing concentrated colloidal CdSe NPLs. Using a hexane solution layer instead of the typically used dried active layers results in a thin and flat layer, even under dense NPL conditions, almost without stressing or charging the surface of the NPLs. Reflectance spectra showed that strong light-matter coupling can be realized at room temperature and that the vacuum Rabi splitting energy is 53.5 meV. Intense photoluminescence (PL) emerges at the lower polariton branch, 25.1 meV (=E<inf>LO</inf>: longitudinal optical (LO) phonon energy) below the energy of the dark states, i.e., the exciton reservoir, indicating that relaxation from the exciton reservoir occurs efficiently in this microcavity due to LO-phonon-assisted relaxation. We describe the reflectance and PL properties using a model in which a cavity photon couples to a one-exciton state delocalized over nonuniformly oriented NPLs. This model contributes to an intuitive, quantitative understanding of the microcavity containing colloidal NPLs.

DOI： 10.1021/acs.jpcc.5c02685

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Fabrication of quantum dot-immobilized Y<inf>2</inf>O<inf>3</inf> microspheres with effective photoluminescence for cancer radioembolization therapy 査読有り国際誌

Miyazaki T., Wakayama T., Oda M., Kawashita M.

Science and Technology of Advanced Materials 25 ( 1 ) 2024年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Microspheres composed of Y-containing materials are effective agents for cancer radioembolization therapy using β-rays. The distribution and dynamics of these microspheres in tissues can be easily determined by providing the microspheres with an imaging function. In addition, the use of quantum dots will enable the detection of microspheres at the individual particle level with high sensitivity. In this study, core – shell quantum dots were bound to chemically modified yttria microspheres under various conditions, and the effect of reaction conditions on the photoluminescence properties of the microspheres was investigated. The quantum dots were immobilized on the surfaces of the microspheres through dehydration – condensation reactions between the carboxy groups of quantum dots and the amino groups of silanetreated microspheres. As the reaction time increased, the photoluminescence peak blue shifted, and the photoluminescence intensity and lifetime decreased. Therefore, a moderate period of the immobilization process was optimal for imparting effective photoluminescence properties. This study is expected to facilitate particle-level tracking of microsphere dynamics in biological tissues for the development of minimally invasive cancer radiotherapy of deepseated tumors. IMPACT STATEMENT We have established a method to immobilize quantum dots on yttria microspheres for cancer radiotherapy and revealed that photoluminescence intensity can be optimized by controlling the immobilization treatment time.

DOI： 10.1080/14686996.2024.2331412

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溶液分散型CdSeナノプレートレット微小光共振器の室温におけるポラリトン発光特性

江頭潤哉, 大和千晃, 馬郡佑季, *小田勝, 近藤久雄

第34回光物性研究会論文集 34 19 - 22 2023年12月

高圧ねじり加工した ZnO の拡散反射スペクトル

本原拓弥, 小林春也, *小田勝, 堀田善治, 山本愛士

第34回光物性研究会論文集 34 191 - 194 2023年12月

溶液分散CdSeナノプレートレット微小共振器の角度分解発光スペクトル

大和千晃, 江頭潤哉, 松尾洋希, 中石勝之介, 小田勝, 近藤久雄

第33回光物性研究会論文集 33 215 - 218 2022年12月

量子ドット蛍光発光強度時系列データのための隠れマルコフモデル解析

古田達央, 濱田啓輔, 小田勝, 中村和磨

第33回光物性研究会論文集 33 211 - 214 2022年12月

Hidden Markov model analysis for fluorescent time series of quantum dots 査読有り

Tatsuhiro Furuta, Keisuke Hamada, Masaru Oda, and Kazuma Nakamura

Physical Review B ( APS ) 106 104305 2022年09月

Modification of the synthesis of layered titanium chloride nitride 査読有り国際誌

Tanaka M., Kataoka N., Kobayashi H., Fujioka M., Oda M., Yamamoto A., Terashima K., Nishii J., Tanaka H., Yokoya T.

Materials Research Bulletin 153 2022年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Layered titanium nitride chloride (TiNCl) exhibits a relatively high superconducting transition of ∼16 K, and it is a candidate for the unconventional superconductor. To better understand the superconductivity, we modified the synthesis process for TiNCl. Highly crystalline TiNCl was prepared by chemical vapor transport at different transport temperatures and intercalated with sodium (Na) metal. Although the crystallographic parameters obtained through Rietveld refinement are similar, the superconducting properties strongly depend on the treatment temperature of pristine TiNCl. Optical and photoemission spectroscopy revealed an in-gap state below the Fermi level, indicating hydrogen incorporation, similar to the case of β−ZrNCl. Hydrogen temperature-programmed desorption revealed hydrogen emission against the heat treatment of the obtained pristine TiNCl. The in-gap state of hydrogen inhibits the introduction of electron carriers from the intercalated Na metal.

DOI： 10.1016/j.materresbull.2022.111896

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CdSeナノプレートレットによる共振器ポラリトンの室温形成と発光特性

松尾洋希, 中石勝之介, 小田勝, 近藤久雄

第32回光物性研究会論文集 ( 第32回光物性研究会 ) 32 2021年12月

高濃度CdSeナノプレートレット溶液を入れた微小共振器の作製とその光学特性評価

永木健太, 松尾洋希, 中石勝之助, 河野結愛, 小田勝, 近藤久雄

第31回光物性研究会論文集 31 253 - 256 2020年12月

CdSeナノプレートレットの合成と微小光共振器効果

細川拓哉、永木健太、松尾洋希、小田勝、近藤久雄

第30回光物性研究会論文集 2019年12月

Synthesis and characterization of quantum dot chains: Self-assembly of mercaptopropionic-acid-capped quantum dots conjugated with short single-stranded DNA 査読有り

Oda M., Sasano K., Nishi A., Zako T., Tani T.

Journal of Physics: Conference Series 1220 ( 1 ) 2019年05月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. In this paper, we describe the synthesis and characterization of quantum dot (QD) chains. We used small QD-DNA conjugates, i.e., short-ligand-capped QDs conjugated with short (15-mers) single-stranded DNA, as the building blocks. The small conjugates were separated based on the valence of the DNA, i.e., the amount of DNA per particle, using agarose gel electrophoresis. The conjugates formed self-assemblies composed of closely spaced (inter-particle spacing of 0.6-2 nm) QDs. We report the results of our investigation of the electrophoresis and hybridization of the conjugation.

DOI： 10.1088/1742-6596/1220/1/012051

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量子ドット一次元配列構造作製へ向けたDNA 機能化量子ドットの分離・精製法の開発

佐々野晃輔、西輝、小田勝、座古保

第29回光物性研究会 2018年12月

微小光共振器中における溶液分散コロイド状半導体量子ドットの発光評価

荒井淳志、細川拓也、小田勝、近藤久雄

第29回光物性研究会論文集 2018年12月

Gel electrophoresis and hybridization of DNA-functionalized quantum-dots as part of a study of linear quantum-dot chains 査読有り

M. Oda, K. Sasano, A. Nishi, T. Zako, T. Tani

EPJ Web of Conferences 190 03009 2018年09月

溶液浸透法によるハロゲン化鉛ぺロブスカイト化合物の単結晶薄膜の作製とその光学応答

近藤久雄, 小田勝

光物性研究会論文集 29 249 - 252 2018年01月

有機無機層状ペロブスカイト型半導体微小共振器における光学応答

近藤久雄, 小田勝

光物性研究会論文集 29 129 - 132 2018年01月

アントラセン微小共振器におけるポラリトン発光

近藤久雄, 小田勝

光物性研究会論文集 29 221 - 224 2018年01月

Synthesis, characterization and its photoluminescence properties of group I-III-VI2 CuInS2 nanocrystals 査読有り

M. Oda, T. Miyaoka, S. Yamada, and T. Tani

Phys. Procedia 29 18 - 24 2012年06月

Room-temperature fluorescence lifetime of pseudoisocyanine (PIC) J excitons with various aggregate morphologies in relation to microcavity polariton formation

Y. Obara, K. Saitoh, M. Oda, T. Tani

International Journal of Molecular Sciences 13 5851 - 5865 2012年05月

Versatile implementation in angle-resolved optical microscopy: its application to local spectrometry of microcavities with PIC-J-aggregates

Y. Obara, K. Saitoh, M. Oda, and T. Tani

International Journal of Spectroscopy 2011 1 - 6 Article ID 523017_1-6 2011年08月

Single molecule FRET detection in CdSe-QD donor and Cy5-labeled molecular chaperone acceptor complex by imaging microscopy

T. Tani, M. Oda, H. Sakai, D. Araki, Y. Itoh, A. Ohtaki, and M.Yohda

Journal of Luminescence 131 519 - 522 2011年03月

Anomalous reflection properties in high density limit fibril shaped PIC-J aggregates in microcavity structure

Y. Obara, K. Saitoh, M. Oda, and T. Tani

Physica Status Solidi C 8 595 - 597 2011年02月

Photoluminescence properties of CdSe/ZnS/TOPO nanocrystals in full- and half-microcavity structures

M. Oda, H. Kazita, Y. Obara, and T. Tani

Physica Status Solidi C 8 423 - 425 2011年02月

Single molecule and single quantum dot photodynamics by polarization-rotating modulation microscopy

T. Tani, H. Sakai, E. Usukura, T. Suzuki and M. Oda：

Phys. Procedia 3 1607 - 1613 2010年02月

Fabrication, characterization and its local reflection properties of a metal-mirror microcavity with high concentrated PIC J-aggregates

M. Oda, Y. Obara, K. Saito, K. Higashi, and T. Tani

Physics Procedia 3 1615 - 1620 2010年02月

Energy transfer in hybrid CdSe quantum dots vs. labelled molecular chaperone systems by imaging microscopy 査読有り

Tani T., Horiuchi H., Oda M., Usukura E., Sakai H., Ohtaki A., Yohda M.

Physica Status Solidi (C) Current Topics in Solid State Physics 6 ( 4 ) 912 - 915 2009年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Resonant energy transfer in hybrid CdSe quantum dot (QD) conjugated with Cy5-labelled molecular chaperone systems is observed with single molecule imaging technique. Photonic QDs are the core-shell type nanocrystals covered with organic surfactants on the outermost surfaces, i.e. CdSe/ZnS/TOPO's, and prefoldin (PFD) is used as prototype molecular chaperons. PFD is a jellyfish-shaped hexameric co-chaperone of group II chaperonins, which recognize hydrophobic portion of denatured proteins and encapsulate them within its central cavity. So the CdSe/ZnS/TOPO QDs can also be captured be cause of its surface similarity to the denatured proteins. We have found one possible reaction pathway to get such artificial complex in aqueous solutions with keeping bioactivities of the proteins. Performance of the complex is evaluated by TIRF imaging microscopy. As the proteins are transparent in visible wavelength region, labeling dyes, Cy5, which also work as acceptors, are connected to detect their behaviors microscopically. Forster type energy transfer is observed from the QD donors to Cy5-labeled PFD acceptors in single molecule level, which can be a distinct evidence for the complex formation. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

DOI： 10.1002/pssc.200880644

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Strong exciton-photon coupling and its polarization dependence in a metal-mirror microcavity with oriented PIC J-aggregates 査読有り

Oda M., Hirata K., Inoue T., Obara Y., Fujimura T., Tani T.

Physica Status Solidi (C) Current Topics in Solid State Physics 6 ( 1 ) 288 - 291 2009年04月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We present a study of strong exciton-photon coupling and its dependence on incident light polarization in a metal-metal mirror microcavity containing PIC J-aggregates. Rabisplitting energies between upper and lower polariton branches are estimated as 94 meV and 69 meV for s- and p-polarized incident light, respectively. These large values are due to large oscillator strength of Frenkel excitons in the PIC J-aggregates and strong confinement of light attributed to the metallic microcavity as well. As for the effective thickness of the active layer for s-polarized light, a good agreement is tained between L efffit = 201nm deduced from the experimental data and Leffcalc = 207 ran calculated from the summation of the measured thickness of active layer with the estimated penetration depths into silver mirrors. We also discuss the difference in the polarization dependences of Rabi-splitting energy, quantitatively. It is concluded mat the polarization dependence is mainly due to an alignment of the J-aggregates in the active layer and is not affected so much by anisotropy of the penetration depths into the silver mirrors. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.

DOI： 10.1002/pssc.200879879

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Synthesis, characterization, and its PL dynamics of colloidal type II CdTe/CdSe nanocrystals 査読有り

Oda M., Nishiyama A., Marumo G., Yamada S., Tanaka E., Tani T.

Physica Status Solidi (C) Current Topics in Solid State Physics 6 ( 1 ) 61 - 64 2009年04月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We describe our improved synthesis and optical properties of high quality type II CdTe/CdSe nanocrystals (NCs). Specifically, clear shell-thickness dependences have been observed in the absorption and photoluminescence (PL) spectra and FL decay profiles as well The magnitude of the lowest absorotion band decreases drastically with large redshift as the shell thickness increases. The origin will be discussed on the bases of the model where the spatial configuration of the lowest electron-hole pair in the NCs changes from that of type I to type II as the shell thickness increases. As for the PL lifetime of the lowest electron-hole excitations, substantial increase is observed with increasing shell thickness. This can also be understood by considering the spatial configuration; spatial overlap between electron and hole wavefunctions decreases with increasing shell thickness, thus the lifetime increases, As for the NCs with extremely thin shell (∼1 ML; 1 ML = 0.35 nm), the PL lifetime seems much longer than expected. This suggests that the thin shells seem imperfect and work rather a kind of trap sites than layers. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.

DOI： 10.1002/pssc.200879878

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Strong exciton-photon coupling and its polarization dependence in a metal-mirror microcavity containing oriented PIC J-aggregates

M. Oda, K. Hirata, T. Inoue, Y. Obara, T. Fujimura, and T. Tani

Physica Status Solidi 6 288 - 291 2009年01月

Synthesis, characterization, and its PL dynamics of colloidal type II CdTe/CdSe nanocrystals

M. Oda, A. Nishiyama, G. Marumo, S. Yamada, E. Tanaka, and T. Tani

Physica Status Solidi 6 61 - 64 2009年01月

FRET-structure with non-radiative acceptor provided by dye-linker-glass surface complex and single molecule photodynamics by TIRFM-polarized imaging

T. Tani, K. Mashimo, T. Suzuki, H. Horiuchi and M. Oda

Journal of Luminescence 128 757 - 760 2008年05月

Complex formation of CdSe/ZnS/TOPO nanocrystal vs. molecular chaperone in aqueous solution by hydrophobic interaction

H. Horiuchi, N. Iwami, F. Tachibana, A. Ohtaki, R. Iizuka, M. Oda, M. Yohda and T. Tani

Journal of Luminescence 127 192 - 197 2007年11月

Photoluminescence behaviors of single CdSe/ZnS/TOPO nanocrystals: Adsorption effects of water molecules onto nanocrystal surfaces

M. Oda, A. Hasegawa, N. Iwami, K. Nishiura, N. Ando, A. Nishiyama, H. Horiuchi and T. Tani

Journal of Luminescence 127 198 - 203 2007年11月

Reversible photobluing of CdSe/ZnS/TOPO nanocrystals

M. Oda, A. Hasegawa, N. Iwami, K. Nishiura, N. Ando, A. Nishiyama, H. Horiuchi and T. Tani

Colloids and Surfaces B: Biointerfaces 56 241 - 245 2007年04月

Photobrightening of CdSe/ZnS/TOPO nanocrystals

M. Oda, J. Tsukamoto, A. Hasegawa, N. Iwami, K. Nishiura, I. Hagiwara, N. Ando, H. Horiuchi and T. Tani

Journal of Luminescence 122-123 762 - 765 2007年01月

Anisotropic observation of absorption and fluorescence transition dipoles in exciton-polariton properties of PIC J-aggregates

T. Tani, M. Oda, T. Hayashi, H. Ohno and K. Hirata

Journal of Luminescence 122-123 244 - 246 2007年01月

Magneto-optical Imaging Using Polarization Modulation Method

T. Ishibashi, Z. Kuang, S. Yufune, T. Kawata, M. Oda, T. Tani, Y. Iimura, and K. Sato

Journal of Applied Physics 100 093903_1 - 093903_6 2006年11月

Real Time Magneto-optical Imaging using Liquid Crystal Modulator

T. Ishibashi, S. Yufune, T. Kawata, M. Oda, T. Tani, Y. Iimura, Y. Konishi, K. Akahane and K. Sato

Journal of the magnetic society of Japan 30 578 - 580 2006年11月

Photoluminescence of CdSe/ZnS/TOPO nanocrystals expanded on silica glass substrates: Adsorption and desorption effects of polar molecules on nanocrystal surfaces

M. Oda, J. Tsukamoto, A. Hasegawa, N. Iwami, K. Nishiura, I. Hagiwara, N. Ando, H. Horiuchi and T. Tani

Journal of Luminescence 119-120 570 - 575 2006年07月

Single molecule imaging towards precise detection of individual photophysics

T. Tani, Y. Yamaguchi, K. Ohuchi and M. Oda

Journal of Luminescence 119-120 173 - 177 2006年07月

Magneto-optical imaging using liquid crystal modulator 査読有り

Ishibashi T., Kuang Z., Yufune S., Oda M., Tani T., Iimura Y., Sato K.

INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 2005年12月

Single-molecule optical detections of carboxytetramethylrhodamine connected by alkyl chains on silica glass substrates

T. Tani, Y. Yamaguchi, K. Ohuchi and M. Oda

Journal of Luminescence 107 42 - 50 2004年05月

Microscopic exciton properties of fibril-shaped molecular J-aggregates prepared in ultra-thin polymer films

T. Tani, M. Saeki, Y. Yamaguchi, T. Hayashi and M. Oda

Journal of Luminescence 107 42 - 50 2004年05月

有機分子に包まれたCapped-CdSeナノ結晶の発光特性

小田勝，塚本純平，長谷川篤史，萩原泉，松林正行，谷俊朗

高分子論文集 61 63 - 74 2004年01月

Optical properties of capped-CdSe nanocrystals covered with organic molecules 査読有り

Oda M., Tsukamoto J., Hasegawa A., Hagiwara I., Matsubayashi M., Tani T.

Kobunshi Ronbunshu 61 ( 1 ) 63 - 74 2004年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

We describe the synthesis of capped-CdSe and capped-CdSe/ZnS nanocrystals and their characterization by micro-spectroscopy of their optical properties as well as high-resolution transmission electron microscope (HRTEM) observations. The narrow spectral bandwidth of absorption and photoluminescence (PL) indicates that the size distributions of the nanoparticles are satisfactorily narrow and that the nanoparticles are nanocrystals, which is confirmed by HRTEM observations. Passivation with overcoating ZnS provides a large enhancement of the photoluminescence intensity, i.e., quantum efficiency reached over 50%. PL observations emitted from the luminescent single nanocrystal are carried out using our custom-made laser scanning optical microscope. A large number of nanocrystals show anomalous on-and-off behavior of their PL. To investigate an origin of the anomalous behavior, we measured integrated PL intensity emitted from over 1000 nanocrystals. As a result, the enhancement of PL intensity is observed with increasing exposure time of excitation light depending on the kind of gases. These photo-induced phenomena are interpreted by the model that the nanocrystals are passivated by the polar molecules, especially water.

DOI： 10.1295/koron.61.63

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高分子薄膜中のフィブリル構造分子性J－会合体―作製と局所光物性評価

谷俊朗，山口義宏，林俊秀，小田勝

高分子論文集 60 712 - 724 2003年12月

Fibril-shaped molecular J-aggregates in thin polymer films-preparation and local photo-physics 査読有り

Tani T., Yamaguchi Y., Hayashi T., Oda M.

Kobunshi Ronbunshu 60 ( 12 ) 712 - 724 2003年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Fibril-shaped J-aggregates of pseudo-isocyanine dyes in ionic polymer poly(vinyl sulfate) are prepared and its optimization of the fabrication conditions have been successfully established. By the custom-made microscopic detection system, as well as imagings, local reflectance spectra and the polarization dependences of the reflectance at the J-band(s) on the specific location of the fibrils with sub micrometer spatial resolution are observed. In the local reflectance spectra, an increase of the bandwidth roughly proportional to the increase of the local reflectance is observed. It is also found that the line shape of the reflection band becomes complicated at a higher reflectance and, from time to time, a dip-like structure appears at a slightly lower energy side of the so-called J-band. These properties can basically be interpreted by the model as a formation of Frenkel exciton-polariton in the fibrils or at least as being at the onset of polariton scheme from the simple exciton scheme. The results of the local fluorescence observation as well as those obtained in the fibrils formed in the ultra thin PVA polymer films are consistent with those of the model. From the local polarization dependences, it is found that the direction of local transition dipoles can deviate from the long chain direction of the fibrils with a wide range of angles up to almost 90 degrees. The deviation appears at the polariton scheme range and also seems to be proportional to the magnitude of the local reflectance. Detailed results and discussions are presented.

DOI： 10.1295/koron.60.712

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Local reflection micro-spectroscopy of excitons in fibril-shaped molecular J-aggregates prepared in PVA thin films

T. Tani, Y. Yamaguchi, M. Saeki, M. Oda and M. Vacha

Journal of Luminescence 102-103 27 - 33 2003年05月

Novel Implementations in Mesoscopic-structured Excitonic Systems: CdSe/ZnS/TOPO Nanocrystals and Molecular J-aggregate fibrils

T. Tani, J. Tsukamoto, Y. Yamaguchi, M. Saeki, K. Hashizume, M. Vacha and M. Oda

Nonlinear Optics 29 537 - 542 2002年12月

Subpicosecond Exciton Dynamics of CuBr Nanocrystals Embedded in PMMA

M. Oda, M. Y. Shen, A. Yamamoto, M. Saito, and T. Goto

Nonlinear Optics 29 409 - 414 2002年07月

High Density Exciton Dynamics of CuBr Nanocrystals Embedded in PMMA

M. Oda, M. Y. Shen, and T. Goto

International Journalof Modern Physics B 15 3912 - 3915 2001年12月

Dynamical process of photoionization in semiconductor nanocrystals

M. Y. Shen, M. Oda, T. Goto, and T Yao

International Journal of Modern Physics B 15 3574 - 3578 2001年12月

Quantum-Size confinement of excitons in CuBr nanocrystals embedded in a polymer

M. Oda, M. Y. Shen, M. Saito, and T. Goto

Journal of Physics: Condensed Matter 13 11465 - 11472 2001年11月

Photobrightening of CuBr nanocrystals in PMMA

M. Oda, M. Y. Shen, M. Saito, and T. Goto

Journal of Luminescence 87-89 469 - 471 2000年05月

Direct Evidence for Photoionization in CdTe Nanocrystals Embedded in Trioctylphosphine Oxide

M. Y. Shen, M. Oda, and T. Goto

Physical Review Letters 82 3915 - 3948 1999年05月

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