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IJPAP Vol.50 [2012] >
IJPAP Vol.50(02) [February 2012] >
| Title: | Preparation and characterisation of yttrium based luminescence phosphors |
| Authors: | Sivakumar, V
Lakshmanan, Arunachalam
Kumar, R Satheesh
Kalpana, S
Rani, R Sangeetha
Jose, M T |
| Keywords: | Lamp and Display Phosphors
Y2O3:Eu3+
YxGd1-x)O3:Eu3+
YAG:Eu3+
(YxGd1-x)BO3:Eu3+
Thermal quenching
Luminescence phosphors |
| Issue Date: | Feb-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | High sensitive Y2O3:Eu3+, Gd2O3:Eu3+,
(YxGd1-x)O3:Eu3+,
YAG (Y3Al5O12):Eu3+ and (YxGd1-x)BO3:Eu3+
luminescence display phosphors have been made by pyrolysis route followed by
sintering at a relatively low temperature of 1000°C. The photoluminescent (PL)
efficiencies of all the five phosphors under UV excitation are found to be
comparable to that of commercial (YxGd1-x)BO3:Eu3+
(LG make). The PL efficiency as well as 395 nm (4f-4f) to 260 nm (charge
transfer) excitation intensity ratio in Y2O3:Eu3+
was found to vary in a complex way with Eu concentration. YAG:Eu3+
could serve as a cheaper substitute to Y2O3:Eu3+
red phosphor used currently in compact fluorescent lamps. While the PL
efficiency of Y2O3:Eu3+ remains fairly
constant with excitation temperature in the region 25-250°C, the PL efficiency of (YxGd1-x)BO3:Eu3+
gets reduced by more than 30% when the excitation temperature increased from 25
to 250°C. |
| Page(s): | 123-128 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.50(02) [February 2012]
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