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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(12) [December 2011] >
| Title: | Synthesis and luminescence studies of novel rare earth activated lanthanum pentaborate |
| Authors: | Nagpure, P A
Bajaj, N S
Sonekar, R P
Omanwar, S K |
| Keywords: | Rare earth polyborates
LaB5O9
Solution combustion
Synthesis
UVB phosphors |
| Issue Date: | Dec-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The lanthanum pentaborate
(LaB5O9)is a novel material which exhibits excellent
luminescence when doped with rare earth ions. It was prepared by a
novel technique which is a slight variation of solution combustion synthesis.
The synthesis is based on the exothermic reaction between the fuel (urea) and
oxidizer (ammonium nitrate). The structure of the prepared material was
confirmed by powder XRD technique. The photoluminescence of rare earth ions (Ce3+,
Eu3+) and sensitized luminescence of Gd3+(Pr3+-Gd3+
and Bi3+-Gd3+) in LaB5O9 have been
studied. LaB5O9:Ce3+ shows broad band UV
emission at 317 nm and LaB5O9:Eu3+ shows
orange red emission. LaB5O9: Pr3+-Gd3+
and LaB5O9: Bi3+-Gd3+ exhibit
efficient luminescence of Gd3+ in narrow UVB region at 310 nm. The
material (La0.5 Pr0.4)B5O9:Gd0.1
exhibits intense narrow band UVB emission at 310 nm and could be a potential
candidate for UVB phosphors used in phototherapy lamps. |
| Page(s): | 799-802 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(12) [December 2011]
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