Color tuning of Y{sub 3}Al{sub 5}O{sub 12}:Ce phosphor and their blend for white LEDs

Journal Article · Tue Jul 01 04:00:00 EDT 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.09.005· OSTI ID:21144036

Thiyagarajan, P; Mishra, J; Ramachandra Rao, M S ^[1]

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1. Materials Science Research Centre, Indian Institute of Technology Madras, Chennai 600 036 (India)

Gadolinium or lanthanum co-doped (0.5 mole) yttrium aluminum garnet doped with cerium phosphors were synthesized by a citric acid gel method and the effect of co-dopants on the structural and luminescent properties were studied. A significant peak shift in the photoluminescence spectra of yttrium aluminum garnet doped cerium was observed from 535 to 556 and 576 nm for gadolinium or lanthanum co-doped phosphors, respectively. The color tuned phosphor were blended with yttrium aluminum garnet doped cerium which showed a considerable improvement in the Commission International De Eclairage chromaticity co-ordinate values of gallium nitride based blue light emitting diode pumped white light. White light emitted from yttrium aluminum garnet doped cerium shows a Commission International De Eclairage value of (0.229, 0.182) whereas the yttrium aluminum garnet doped cerium phosphor blended with gadolinium or lanthanum co-doped phosphor shows (0.262, 0.243) and (0.295, 0.282), respectively. These results demonstrate the possibility to use these phosphor blends to enhance the white light generation in the field of white-light emitting diode solid-state lighting.

• OSTI ID: 21144036
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CERIUM
DOPED MATERIALS
GADOLINIUM
GADOLINIUM COMPOUNDS
GALLIUM NITRIDES
LIGHT EMITTING DIODES
PHOTOLUMINESCENCE
SPECTRA
YTTRIUM COMPOUNDS