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Development of Red CaAlSiN3:Eu2+ Phosphor in Glass Ceramic Composite for Automobile LED with High Temperature Stability

고온 안정성이 우수한 자동차 LED용 Red CaAlSiN3:Eu2+ 형광체/Glass 세라믹 복합체 개발

  • Yoon, Chang-Bun (Department of Advanced Materials Engineering, Korea Polytechnic University)
  • 윤창번 (한국산업기술대학교 신소재공학과)
  • Received : 2018.02.24
  • Accepted : 2018.03.27
  • Published : 2018.07.01

Abstract

Red phosphor in glasses (PiGs) for automotive light-emitting diode (LED) applications were fabricated with 620-nm $CaAlSiN_3:Eu^{2+}$ phosphor and Pb-free silicate glass. PiGs were synthesized and mounted on high-power blue LED to make a monochromatic red LED. PiGs were simple mixtures of red phosphor and transparent glass powder. After being fabricated with uniaxial press and CIP at 300 MPa for 20 min, the green bodies were thermally treated at $550^{\circ}C$ for 30 min to produce high dense PiGs. As the phosphor content increased, the density of the sintered body decreased and PiGs containing 30% phosphor had a full sintered density. Changes in photoluminescence spectra and color coordination were studied by varying the thickness of plates that were mounted after optical polishing. As a result of the optical spectrum and color coordinates, PiG plate with $210{\mu}m$ thickness showed a color purity of 99.7%. In order to evaluate the thermal stability, the thermal quenching characteristics were measured at temperatures of $30{\sim}150^{\circ}C$. The results showed that the red PIG plates were 30% more thermally stable compared to the AlGaInP red chip.

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