HIGH EFFICIENCY WHITE ORGANIC LIGHT EMITTING DEVICES

Abstract This paper reports the fabrication of a high efficiency and high brightness white Organic Light Emitting Device (OLED) based on evaporated small molecules. The luminous efficiency of the device is approximately 1.5 lumens/watt, which, to the best of our knowledge, is the highest reported efficiency in the literature. Brightness in excess of 1000 cd/m 2 is achieved at a voltage of 10V. The emitted white light, with CIE coordinates of x=0.33 and y=0.33, can be converted to red, green and blue sub‐pixels using color filters. The OLED device comprises an emission layer made of DPV type host with a single fluorescent dopant. The emission layer is sandwiched between a hole transport layer and an electron transport layer (Alq 3 ).