Mechanisms behind green photoluminescence in ZnO phosphor powders
Mechanisms behind green photoluminescence in ZnO phosphor powders
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DOI：
10.1063/1.362349
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发表时间：
1996-05-15
影响因子：
3.2
通讯作者：
Gnade, BE
中科院分区：
文献类型：
--
作者：
Vanheusden, K;Warren, WL;Gnade, BE
我们探索的绿色510 nm的发射，自由载流子浓度，并结合光致发光，光吸收和电子顺磁共振光谱的商业ZnO磷光体中的顺磁氧空位密度之间的相互关系。我们发现，绿色发射强度强烈的影响，在颗粒表面的自由载流子耗尽，特别是对于小颗粒和/或低掺杂。我们的数据表明，单离子化的氧空位是负责在ZnO的绿色发射，这种发射结果从光生空穴与单离子化的电荷状态的这种缺陷的重组。(C)1996年美国物理学会。
We explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen-vacancy density in commercial ZnO phosphors by combining photoluminescence, optical-absorption, and electron-paramagnetic-resonance spectroscopies. We find that the green emission intensity is strongly influenced by free-carrier depletion at the particle surface, particularly for small particles and/or low doping. Our data suggest that the singly ionized oxygen vacancy is responsible for the green emission in ZnO; this emission results from the recombination of a photogenerated hole with the singly ionized charge state of this defect. (C) 1996 American Institute of Physics.