Optical Properties of White Organic Light-Emitting Devices Fabricated Utilizing a Mixed CaAl_(12)O_(19):Mn~(4+) and Y_3Al_5O_(12):Ce~(3+) Color Conversion Layer

摘要

White organic light-emitting devices (OLEDs) were fabricated by combining a blue OLED with a color conversion layer made of mixed Y_3Al_5O_(12):Ce~(3+) green and Ca_(12)AlO_(19):Mn~(4+) red phosphors. The X-ray diffraction patterns showed that Ce~(3+) ions in the Y_3Al_5O_(12):Ce~(3+) phosphors completely substituted for the Y~(3+) ions and the Mn~(4+) ions in the CaAl_(12)O_(19):Mn~(4+) phosphors completely substituted for the Ca~(2+) ions. Electroluminescence spectra at 11 V for the OLEDs fabricated utilizing a color conversion layer showed that the Commission Internationale de l'Eclairage coordinates for the Y_3Al_5O_(12):Ce~(3+) and CaAl_(12)O_(19):Mn~(4+) phosphors mixed at the ratio of 1:5 and 1:10 were (0.31, 0.34) and (0.32, 0.37), respectively, indicative of a good white color.