Luminescence investigations of Ce3+ doped CaS nanophosphors

被引：49

作者：

Kumar, Vinay ^{[1
]}

Pitale, Shreyas S.

Mishra, Varun

Nagpure, I. M.

Biggs, M. M.

Ntwaeaborwa, O. M.

Swart, H. C.

机构：

[1] Univ Orange Free State, Dept Phys, ZA-9300 Bloemfontein, The Free State, South Africa

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 492卷 / 1-2期

基金：

新加坡国家研究基金会;

关键词：

Luminescence; Alkaline earth sulfide; Nanophosphors; CALCIUM SULFIDE; AFTERGLOW TIME; PHOSPHOR; PHOTOLUMINESCENCE; CATHODOLUMINESCENCE; MECHANISM; ION;

D O I：

10.1016/j.jallcom.2009.11.076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ce3+ doped CaS nanophosphors were synthesized using the chemical co-precipitation method. The samples were characterized using X-ray diffraction, transmission electron microscopy, electron dispersive X-ray spectroscopy, UV-vis absorption spectroscopy and photoluminescence (PL) spectroscopy. The PL emission peaks of both the D-2(5d) --> F-2(5/2) (4f) and D-2(5d) --> F-2(7/2)(4f) transitions of the Ce3+ ion were blue-shifted from the normal PL emission of bulk CaS:Ce at 517 nm, suggesting that the particle sizes of CaS:Ce phosphors synthesized in this study were in the nanometer scale. The effect of different dopant concentrations on the PL emission intensity was also investigated. The maximum PL emission intensity was observed when CaS was doped with 0.04 mol% of the Ce3+. Compared with commercial phosphors (CaS:Ce), the decay lifetime of the present samples was found to be longer in the order of a few milliseconds probably due to increased radiative relaxation processes. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：L8 / L12

页数：5

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