Influence of temperature and photoexcitation density on the quantum efficiency of defect emission in ZnO powders

被引：23

作者：

Foreman, J. V.

Everitt, H. O. ^{[1
]}

Yang, J.

Liu, J.

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

[2] Duke Univ, Dept Chem, Durham, NC 27708 USA

[3] USA, Aviat & Missile Res Dev & Engn Ctr, Redstone Arsenal, AL 35898 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 01期

关键词：

D O I：

10.1063/1.2753540

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of laser excitation power density on the efficiency of intrinsic defect emission in ZnO powders was characterized by varying the laser irradiance over three orders of magnitude and monitoring changes in the samples' photoluminescence. The external quantum efficiency of the visible wavelength, broadband defect photoluminescence was found to depend not only on laser irradiance but also on temperature and prior annealing conditions. This material system is potentially useful as an ultraviolet-photoexcited, white light phosphor under low-power excitation (< 0.2 W/cm(2)) at room temperature and below. (c) 2007 American Institute of Physics.

引用

页数：3

共 18 条

[1] An improved experimental determination of external photoluminescence quantum efficiency [J].