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J. Korean Ceram. Soc. > Epub ahead of print

doi: https://doi.org/10.4191/kcers.2019.56.1.04    [Epub ahead of print]
Monochromatic Amber Light Emitting Diode with YAG and CaAlSiN3 Phosphor in Glass for Automotive Applications
Jeong Woo Lee1, Jae Min Cha1, Jinmo Kim2, Hee Chul Lee1, Chang-Bun Yoon1
1Department of Advanced Materials Engineering, Korea Polytechnic University, Siheung 15073, Korea
2Micro LED Research Center, Korea Photonics Technology Institute, Gwangju 61007, Korea
Correspondence  Chang-Bun Yoon ,Tel: +82-31-8041-0596, Fax: +82-31-8041-0599, Email: cbyoon@kpu.ac.kr
Received: October 29, 2018; Revised: November 28, 2018   Accepted: November 28, 2018.  Published online: January 10, 2019.
ABSTRACT
Monochromatic amber phosphor in glasses (PiGs) for automotive LED applications were fabricated with YAG:Ce3+, CaAlSiN3:Eu2+ phosphors and Pb-free silicate glass. After synthesis and thickness-thinning process, PiGs were mounted on highpower blue LED to make monochromatic amber LEDs. PiGs were simple mixtures of 566 nm yellow YAG, 615 nm red CaAlSiN3:Eu2+ phosphor and transparent glass frit. The powders were uniaxially pressed and treated again through CIP (cold isostatic pressing) at 200 MPa for 20 min to increase packing density. After conventional thermal treatment at 550°C for 30 min, PiGs were applied by using GPS (gas pressure sintering) to obtain a fully dense PiG plate. As the phosphor content increased, the density of the sintered body decreased and PiGs containing 30 wt% phosphor had full sintered density. Changes in photoluminescence spectra and color coordination were investigated by varying the ratio of YAG/CaAlSiN3 and the thickness of the plates. Considering the optical spectrum and color coordinates, PiG plates with 240 µm thickness showed a color purity of 98% and a wavelength of about 605 nm. Plates exhibit suitable optical characteristics as amber light-converting material for automotive LED applications.
Key words: YAG:Ce3+, CaAlSiN3:Eu2+, Phosphor in glass (PiG), Glass frit, Amber LED
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