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Title: Laser-induced phosphorescence studies of doubly-doped CaS phosphors
Authors: Bhatti, H S
Sharma, Rajesh
Verma, N K
Kumar, Sunil
Issue Date: Apr-2004
Publisher: CSIR
IPC Code: Int. Cl.7 C 09 K 11/60; C 09 K 11/84
Abstract: Effect of killer impurities (Fe, Co and Ni) on excited state life-times in CaS phosphors, doped with copper and having variable concentrations of iron, cobalt and nickel has been studied in this paper. The phosphors have been synthesized, and, then using a nitrogen laser as the excitation source, their decay-curve analysis has been done. Various strong emissions have been detected and the corresponding excited state life-time values  measured. These studies are conducted at room temperature. Very interesting results are obtained with the addition of killer impurities in the phosphors with single impurity. Life-time values found to decrease appreciably with the addition of killer impurities (at lower concentration) in the singly doped phosphors. These studies are important as the excited state life-time of the sulphide phosphors prepared by flux method converge to the longer side only, but with the addition of killer impurities at a particular concentration, values of the life-times decreases up to large extent. At higher concentration of killer impurities deeper traps contribute to the phosphorescence, leading to the much higher increase in life-time values.
Page(s): 121-124
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.11(2) [April 2004]

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