Preparation and Investigation of High Efficiency White Organic Light Emitting Diodes

White organic light-emitting diodes (WOLEDs) have attracted considerable attention due to their potential applications in full-color flat panel displays, back-lighting sources for liquid-crystal displays, and especially in solid-state lightings. The energy cost has risen sharply in the international market lately. People have also become more environmentally concerned. High efficiency and high quality solid-state light-emitting diode illumination technology has become the common challenge and opportunity for both the academia and the industry. We have prepared and investigated white organic light-emitting diodes. The power efficiency could reach 40 lm/W, and it could be further improved to 70 lm/W with appropriate light extraction technology. In this research proposal, we focus on two parts. (1) High efficient small molecule organic white light emitting OLEDs using novel materials and device structures. (2) The development and evaluation of n-doping effects in polymer white-light emitting OLEDs. In the first part, the phosphorescent blue and red-emitting materials are used as dopants, and a highly steric hindrance material is served as the host material to prepare the high efficient white OLED devices under the simple device architecture. In the second part, we are using several n-type dopants to develop the high efficient polymer white light emitting diodes. We will further evaluate the n-doping effects to optimize the white light emitting device efficiency.

Project ID:PB10107-1749
External Project ID:NSC101-2221-E182-007