Luminescence of nanocrystalline ZnS:CU2+

被引:191
作者
Bol, AA [1 ]
Ferwerda, J [1 ]
Bergwerff, JA [1 ]
Meijerink, A [1 ]
机构
[1] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands
关键词
ZnS:Cu; nanocrystals; time resolved spectroscopy;
D O I
10.1016/S0022-2313(02)00350-2
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Temperature dependent luminescence and luminescence lifetime measurements are reported for nanocrystalline ZnS:Cu2+ particles. Based on the variation of the emission wavelength as a function of particle size (between 3.1 and 7.4 nm) and the low quenching temperature (T-q = 135 K), the green emission band is assigned to recombination of an electron in a shallow trap and CU2+. The reduction in lifetime of the green emission (from 20 mus at 4 K to 0.5 mus at 300 K) follows the temperature quenching of the emission. In addition to the green luminescence, a red emission band, previously only reported for bulk ZnS:Cu2+, is observed. The red emission is assigned to recombination of a deeply trapped electron and Cu2+. The lifetime of the red emission is longer (about 40 mus at 4 K) and the quenching temperature is higher. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:325 / 334
页数:10
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