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Proceedings Paper

Optical optimization of (Gd2-x-yAlx)O3:Eu3+y red phosphors for displays and YAG:Ce phosphors for white LEDs by combinatorial chemistry
Author(s): Seonghoon Lee; Soo-Yeon Seo; Kee-Sun Sohn; Hee Dong Park
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Paper Abstract

We optimized co-doped (Gd2-x-yAx)O3:Eu3+y phosphors for red FED phosphors using a combinatorial synthetic method and monitoring their photoluminescence and cathodoluminescence at low-voltage excitation. We have used a scanning multi-inkjet or adjustable micropipette delivery system and delivered micro- liter volumes of precursor solutions to the collection of each sample holders rapidly and accurately. Using combinational chemistry, we can at once characterize the UV, VUV, and CL properties of many individual compounds prepared in each sample holders. We find that Al co-doped Gd2O3:Eu3+ phosphors, i.e. (Gd1.83Al0.05)O3:Eu3+0.12 are superior to the commercial Y2O3:Eu phosphors at low-voltage excitation 400V. The filament lightbulbs and halogen lamps are widely used to light houses and offices but are energy-inefficient. GaN- based blue LEDs are the excitation source for YAG:Ce phosphors and the YAG:Ce phosphors convert the blue light into red and green lights. Using combinatorial chemistry, we find the optimal YAG:Ce phosphors, (Y0.95Ce0.05)3Al5O12 for white LEDs. We fabricate highly energy-efficient white light emitting diodes by combining Yttrium Aluminium Garnet (YAG):Ce phosphors and blue LEDs.

Paper Details

Date Published: 5 December 2001
PDF: 11 pages
Proc. SPIE 4445, Solid State Lighting and Displays, (5 December 2001); doi: 10.1117/12.450031
Show Author Affiliations
Seonghoon Lee, Kwangju Institute of Science and Technology (South Korea)
Soo-Yeon Seo, Kwangju Institute of Science and Technology (South Korea)
Kee-Sun Sohn, Korea Research Institute of Chemical Technology (South Korea)
Hee Dong Park, Korea Research Institute of Chemical Technology (South Korea)

Published in SPIE Proceedings Vol. 4445:
Solid State Lighting and Displays
Ian T. Ferguson; Yoon-Soo Park; Nadarajah Narendran; Steven P. DenBaars, Editor(s)

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