新穎白光發光二極體紅光螢光粉

New Red Phosphors for Fabrication of White Light LEDs

陳登銘(Teng-Ming Chen)

《光學工程》 122期 (2013/07) Pp. 12-18

摘要

白光發光二極體體積小、節能、環保又耐用，被稱為下一世代新光源。螢光粉轉換白光發光二極體為目前市場主流產品，為研發色溫可調控、高演色性與高效率兼具的螢光粉，本研究報導兩種可以吸收藍光的非傳統紅光螢光粉的製備、發光特性、熱消光行為，並評估其封裝白光發光二極體的應用潛力。預期可以作為輔助或有效替代價格較昂貴的氮化物螢光粉，並提供白光LED封裝的另一種新選擇。

關鍵字

紅光螢光粉 ； 白光發光二極體 ； 熱消光

並列摘要

Two unprecedented red-emitting phosphors, CaZnOS:Eu2+ and -YFS:Ce^3+, were prepared, investigated and evaluated for potential fabrication of blue LED-pumped white-light LED. We demonstrated that both phosphors were found to emit strong red emission at 650-672 nm upon absorption of blue light (460-470 nm) with quantum efficiency of 26.0%-35.5% depending on the chemical compositions. Temperature-dependent photoluminescence spectra indicated these phosphors show moderate luminescence quenching stability. A white-light LED fabricated using YAG/BOS/(Ca0.96 Eu0.04)ZnOS combination shows color rendering index of 85 and luminous efficiency of 25.6 W/lm.

並列關鍵字

Red phosphors ； white-light LED ； CaZnOS:Eu^2+ ； -YFS:Ce^3+thermal luminescence quenching