CaS1-xSex:Eu 형광체의 발광 특성
Photoluminescence properties of CaS1？xSex : Eu phosphors
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초록
형광체-변환 3파장 백색 발광 다이오드 (LED)의 응용을 위하여 일련의 CaS1 . xSex: Eu 형광체를 합성하였다. CaS1 . xSex: Eu의 구조와 발광 특성을 조사하였다. CaS1 . xSex: Eu 형광체는 청색 발광 다이오드의 발광 파장인 455 nm에서 강한 흡수가 있다. Eu2+의 4f65d1 (T2g) → 4f7 (8S7/2) 전이 때문에 CaS : Eu는 651 nm에서 적색 발광 봉우리를 가지고 있다. CaS1 . xSex: Eu의 발광 봉우리는 Se이 증가함에 따라서 651 nm에서 598 nm으로 이동이 된다. CaS1 . xSex: Eu 형광체는 청색 LED로 여기하면 가변 파장의 적색 발광을 하는 형광체로 사용될 수 있다. SrGa2S4: Eu와 CaS0.50Se0.50: Eu 형광체를 청색 발 광 다이오드에 도포하여 백색 발광 다이오드를 제작하였다.
Abstract
We synthesized a series of CaS1 xSex: Eu red-emitting phosphors for application in phosphor-converted three-band white light emiting diode (LED). The photoluminescence and structural properties of CaS1 xSex : Eu were examined.The CaS1 xSex: Eu phosphors have a strong absorption at 455 nm, which is the emission wavelength of a blue LED.CaS : Eu has a red emission peak at 651 nm due to the 4f65d1 (T2g)→ 4f7 (8S7/2) transition of the Eu2+. The emission peakof CaS1 xSex:Eu is shifted from 651 to 598 nm with increasing Se content. CaS1 xSex: Eu can be used as wavelength-tunable red-emitting phosphors pumped by a blue LED. We also fabricated a three-band white LED by doping SrGa2S4:Euand CaS0.50Se0.50: Eu phosphors onto a blue LED chip.Key words CaS1 xSex: Eu, Red-emitting phosphor, White LEDCaS1xSex:Eu .... .. ....... ...†..... ... , .. , 448-701(2007. 8. 28. .. )(2007. 9. 20. .... ). . ... -.. 3.. .. .. .... (LED). ... ... ... CaS1 xSex:Eu .... ..... .CaS1 xSex:Eu. ... .. ... ..... . CaS1 xSex:Eu .... .. .. ..... .. ... 455 nm.... ... .. . Eu2+. 4f65d1 (T2g) → 4f7 (8S7/2) .. ... CaS : Eu. 651 nm.. .. .. .... ... .. .CaS1 xSex:Eu. .. .... Se. .... ... 651 nm.. 598 nm.. ... .. . CaS1 xSex:Eu .... ..LED. .... .. ... .. ... .. .... ... . .. . SrGa2S4:Eu. CaS0.50Se0.50:Eu .... .. .
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