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고온 안정성이 우수한 자동차 LED용 Red CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> 형광체/Glass 세라믹 복합체 개발
윤창번,Yoon, Chang-Bun 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
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.
고온 안정성이 우수한 자동차 LED용Red CaAlSiN₃:Eu²+ 형광체/Glass 세라믹 복합체 개발
윤창번 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
본 연구에서는 소결 온도가 550°C 이하인 규산염 유리와 CASN:Eu2+형광체를 사용하여 고색순도의 적색 LED용 고밀도의 PiG를 제작하였다. 시료 제작을 위해 형광체와 Glass를 혼합물을 일축성형한 후에 CIP하였고, 550도에서 30분동안 열처리하였다. 광학적 특성을 평가하기 위해서 150~240um으로 가공 후에 전류 350 mA에서 작동하는 상업용 청색 LED 위에 PiG 플레이트를 장착하여 색좌표, 색순도, 중심파장 등의 광학특성을 측정하였다. 제작된 PiG 플레이트와 기존의 Red Chip LED의 고온 휘도 유지율(Thermal Quenching)을 비교하기 위해 100°C까지 승온시키며 평가한 결과 기존 Red Chip LED 대비 약 30% 향상되는 효과를 얻었다. Red phosphor in glasses (PiGs) for automotive light-emitting diode (LED) applications were fabricated with620-nm CaAlSiN3:Eu2+ phosphor and Pb-free silicate glass. PiGs were synthesized and mounted on high-power blue LEDto make a monochromatic red LED. PiGs were simple mixtures of red phosphor and transparent glass powder. Afterbeing fabricated with uniaxial press and CIP at 300 MPa for 20 min, the green bodies were thermally treated at 550℃for 30 min to produce high dense PiGs. As the phosphor content increased, the density of the sintered body decreasedand PiGs containing 30% phosphor had a full sintered density. Changes in photoluminescence spectra and colorcoordination were studied by varying the thickness of plates that were mounted after optical polishing. As a result ofthe optical spectrum and color coordinates, PiG plate with 210 μm thickness showed a color purity of 99.7%. In orderto evaluate the thermal stability, the thermal quenching characteristics were measured at temperatures of 30~150℃. Theresults showed that the red PIG plates were 30% more thermally stable compared to the AlGaInP red chip.