A time-resolved luminescence spectroscopy study of self-trapped excitons in KH2PO4 crystals

被引：13
|
作者：
Ogorodnikov, IN
Kirm, M
Pustovarov, VA
Cheremnykh, VS
机构：
[1] Urals State Tech Univ, Dept Expt Phys, Ekaterinburg 620002, Russia
[2] Univ Hamburg, Inst Experimentalphys, D-22761 Hamburg, Germany
来源：
RADIATION MEASUREMENTS | 2004年 / 38卷 / 03期
基金：
俄罗斯基础研究基金会;
关键词：
potassium dihydrophosphate KH2PO4 (KDP); self-trapped exciton; time-resolved luminescence; excitation spectra;
D O I：
10.1016/j.radmeas.2004.01.038
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
A complex investigation of the dynamics of electronic excitations in potassium dihydrophosphate (KDP) crystals is performed by the low-temperature time-resolved vacuum ultraviolet optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP crystals, data on the kinetics of the photoluminescence (PL) decay, time-resolved PL spectra (2-6.2 eV), and time-resolved excitation PL spectra (4-24 eV) at 10 K were obtained for the first time. The intrinsic character of the PL of KDP in the vicinity of 5.2 cV, which is caused by the radiative annihilation of self-trapped excitons (STEs), is ascertained; sigma and pi bands in the luminescence spectra of the STEs, which are due to singlet and triplet radiative transitions, are resolved; and the shift of the sigma band with respect to the pi band in the spectra of the STEs is explained. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：331 / 334
页数：4
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