White organic light-emitting devices using organic/inorganic color conversion film

A novel white organic light-emitting device(WOLED) using a strategy of exciting organic/inorganic color conversion film with a blue organic light-emitting diode(OLED) is reported. The luminescent layer of the blue OLED is prepared by using of CBP host blended with a blue highly fluorescent dye N-BDAVBi. The organic/inorganic color conversion film is prepared by dispersing a mixture of red pigment VQ-D25 and YAG phosphor in PMMA. A novel WOLED with the high color stability by optimizing the thickness and fluorescent pigment concentration of the color conversion film are achieved. When the driving voltage varied between 6 V to 14 V, the color coordinates varied slightly from(0.354, 0.304) to(0.357, 0.312) and the maximum current efficiency is about 5.8 cd/A(4.35 mA/cm2), the maximum brightness is 16 800 cd/m2 at the operating voltage of 14 V.