Journal
JOURNAL OF LUMINESCENCE
Volume 99, Issue 4, Pages 325-334Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2313(02)00350-2
Keywords
ZnS:Cu; nanocrystals; time resolved spectroscopy
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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.
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