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Synthesis of Lu3Al5O12:Ce3+ Nano Phosphor by Coprecipitation Method, and Their Optical Properties  

Kang, Taewook (Interdisciplinary Program of LED and Solid State Lighting Engineering, Pukyong National University)
Kang, Hyeonwoo (Department of Display Engineering, Pukyong National University)
Kim, Jongsu (Department of Display Engineering, Pukyong National University)
Kim, Gwangchul (Physic Department, School of Liberal Arts, KOREA TECH)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.4, 2019 , pp. 51-56 More about this Journal
Abstract
LuAG:Ce(Lu3Al5O12:Ce3+) nano phosphor were synthesized by applying the coprecipitation method. It is used to increase the color rendering of phosphor ceramic plate for high power LEDs and laser lighting. Internal quantum efficiency and absorption of LuAG:Ce nano phosphor are 51.5 % and 64.4 %, respectively, which is higher than the previously studied nano phosphors. The maximum absorption wavelength of this phosphor is 450 nm blue light, and the emission wavelength is 510 nm. The emission wavelength shifted to longer wavelength when the concentration of Ce increased in the heat treatment of the reducing atmosphere. Thermal quenching of LuAG nano phosphor was 70 % at 200 ℃, it was explained by their significant quenching of all raman scattering modes, implying the restriction of electron-phonon couplings caused by their defects.
Keywords
$Lu_3Al_5O_{12}:Ce^{3+}$; coprecipitation; photoluminescence; white light emitting diode;
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