Title :
Emission characteristics of white light phosphor
Author :
Lee, K.M. ; An, Bao-li ; Gong, Meng-lian ; Liu, Ying-liang ; Cheah, K.W.
Author_Institution :
Dept. of Phys., Hong Kong Baptist Univ., China
Abstract :
White light LED was successfully fabricated by converting near-UV LED emission (390-420 nm) with a new white light phosphor. This new white phosphor was consisted of three fluorescence materials; two strontium aluminates based with lanthanide oxides, SrAl2O4:Eu2+ (for green (520 nm) emission) and Sr4Al14O25:Eu2+ (for blue (490 nm) emission) and new organometallic Eu complex, (for red (614 nm) emission). These materials have good absorption in the 300-500 nm range and have high quantum efficiencies (4.7-24.5%). The white light LED has a CIE value of (0.321, 0.365, 0.314).
Keywords :
europium; light emitting diodes; phosphors; strontium compounds; ultraviolet spectra; visible spectra; 300 to 500 nm; 4.7 to 24.5 percent; 490 nm; 520 nm; 614 nm; Sr4Al14O25:Eu; SrAl2O4:Eu; absorption; near-UV LED emission; organometallic Eu complex; quantum efficiencies; strontium aluminates; white light LED; white light phosphor; Chemical engineering; Chemistry; Fluorescence; Light emitting diodes; Light sources; Optical materials; Phosphors; Physics; Stimulated emission; Sun;
Conference_Titel :
Lasers and Electro-Optics, 2003. CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on
Print_ISBN :
0-7803-7766-4
DOI :
10.1109/CLEOPR.2003.1277259
