Exciton Annihilation in ZnO Ultrafine Particles with Size of 10–40 nm

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概要

• 論文の詳細を見る

• Photoluminescence and time-resolved photoluminescence spectra of ZnO ultrafine particles with the size of 10–40 nm have been studied at 10 K. The ZnO ultrafine particles exhibit luminescence bands originating from the radiative recombination of free and bound excitons accompanied by the emissions of longitudinal optical (LO) phonons. With decreasing size of the particles, all the luminescence bands become broad, and the luminescence band of 2LO phonon replicas becomes stronger than that of 1LO phonon replicas. The time-resolved photoluminescence spectra reveal that the decay times of bound and free excitons become shorter for smaller particles. The experimental results suggest that the exciton annihilation processes in ZnO ultrafine particles are influenced by the particle surface.

• Japan Society of Applied Physicsの論文
• 2007-06-25

著者

• Matsumura Michio

  Research Center For Photoenergetics Of Organic Materials Osaka University

• Ohno Nobuhito

  Academic Frontier Promotion Center Osaka Electro-communication University

• HIRAI Takeshi

  Academic Frontier Promotion Center, Osaka Electro-Communication University

• Hashimoto Satoshi

  Department Of Emergency And Critical Care Medicine Kumamoto Medical Center National Hospital Organiz

• Ohno Nobuhito

  Academic Frontier Promotion Center, Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan

• Harada Yoshiyuki

  Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Osaka 535-8585, Japan

• Hirai Takeshi

  Academic Frontier Promotion Center, Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan

• Hashimoto Satoshi

  Deparment of Environmental Sciences, Faculty of Science, Osaka Women's University

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