Simulation of a new architecture of organic white-light-emitting diode by quantum dot and photonic crystal to improve efficiency

نویسندگانندا حیدری,سیدمحمدباقر قریشی,محمد رضا فتح الهی
نشریهOPTIK
شماره صفحات1
شماره مجلد205
ضریب تاثیر (IF)ثبت نشده
نوع مقالهFull Paper
تاریخ انتشار2020-01-15
رتبه نشریهعلمی - پژوهشی
نوع نشریهالکترونیکی
کشور محل چاپایران
نمایه نشریهJCR

چکیده مقاله

A novel inverted hybrid quantum dot/organic light-emitting diode (IH-QDOLED) with a transparent conducting oxide photonic crystal structure is proposed in this study. Such improved electrical and optical characteristics as luminescence efficiency, extraction efficiency, external quantum efficiency, carrier injection, size-tunable color of QDs, and solution-processable fabrication make IH-QDOLEDs a good candidate with which to achieve high-performance and lowcost LED (light-emitting diode) devices. These efficient LEDs consist of three rows of CdSe quantum dots with different sizes blended in TPBi. In order to optimize the IH-QDOLED structure, we have performed a simulation based on the finite difference time domain (FDTD) method. Also, the characteristics of this novel structure have been compared with those of a conventional structure. As it is found, the maximum external quantum efficiency (EQE) is increased from 30 % to 50 %, and the turn-on voltage has risen from 4.5 V to 5.5 V, compared to the conventional structure. Our results show that the angular distribution of the radiant power is uniform over a wider range of view angles, which can be attributed to the interaction of guided modes with an embedded photonic crystal structure.

tags: Photonic crystal structure,White-light-emitting diode,Simulation,Efficiency