| 초록 |
White organic light-emitting diodes (OLEDs) have attracted considerable attention due to their important applications in flat panel displays, general lighting. The biggest challenge of conventional OLEDs is the limited light outcoupling efficiency about 20 % while the internal quantum efficiency of OLEDs approaches almost 100 %. In this work, we develop a high performance down-conversion microlens array (DC-MLA) films for white OLEDs. The DC-MLA films are fabricated by a soft imprinting method with breath figure patterns, which are low-cost, simple and quick solution process. Blue OLEDs employing the DC-MLA films exhibit highly enhanced light outcoupling efficiency and high quality of white light. The DC-MLA films improve the external quantum efficiency (EQE) of white OLEDs by a factor of 1.45. In addition, high quality white light with a color rendering index of 84.3 is achieved for the white OLEDs with DC-MLA films. |
