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

来源：

JOURNAL OF LUMINESCENCE | 2002年 / 99卷 / 04期

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

页码：325 / 334

页数：10

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