[Effects of white organic light-emitting devices using color conversion films on electroluminescence spectra].
The authors report a novel white organic light-emitting device (WOLED), which uses a strategy of exciting organic/ inorganic color conversion film with a blue organic light-emitting diode (OLED). The luminescent layer of the blue OLED was prepared by use of CBP host blended with a blue highly fluorescent dye N-BDAVBi. The organic/inorganic color conversion film was prepared by dispersing a mixture of red pigment VQ-D25 and YAG : Ce3+ phosphor in PMMA. The authors have achieved a novel WOLED with the high color stability by optimizing the thickness and fluorescent pigment concentration of the color conversion film. When the driving voltage varied between 6 and 14 V, the color coordinates (CIE) varied slightly from (0.354, 0.304) to (0.357, 0.312) and the maximum current efficiency is about 5.8 cd x A(-1) (4.35 mA x cm(-2)), the maximum brightness is 16 800 cd x m(-2) at the operating voltage of 14 V.
Hou
Qing-Chuan
QC
School of Materials Science & Engineering, Tianjin University of Technology, Key Laboratory of Photoelectric Display Materials & Devices, Ministry of Education, Tianjin 300384, China. houqingchuan@gmail.com
Wu
Xiao-Ming
XM
Hua
Yu-Lin
YL
Qi
Qing-Jin
QJ
Li
Lan
L
Yin
Shou-Gen
SG