1 聊城大学 物理科学与信息工程学院, 山东 聊城 252059
2 山东省光通信科学与技术重点实验室, 山东 聊城 252059
为了提高以TADF材料作为主体、天蓝色荧光材料作为客体的混合薄膜的OLED器件光电性能, 我们调整了器件结构, 使主体材料发挥其优势。制备了基本结构为ITO/NPB(40 nm)/DMAC-DPS∶x%BUBD-1(40 nm)/Bphen(30 nm)/LiF(0.5 nm)/Al的OLED器件。研究了主-客体材料在不同掺杂浓度下的OLED器件的光电特性。为了提高主体材料的利用率, 在空穴传输层和发光层之间加入10 nm的DMAC-DPS作为间隔层; 然后, 在阳极和空穴传输层之间加入HAT-CN作为空穴注入层, 形成HAT-CN/NPB结构的PN结, 有效降低了器件的启亮电压(2.7 V)。测量了有无HAT-CN的单空穴器件的阻抗谱。结果表明, 在最佳掺杂比例(2%)下, 器件的外量子效率(EQE)达到4.92%, 接近荧光OLED的EQE理论极限值; 加入10 nm的DMAC-DPS作为间隔层, 使得器件的EQE达到5.37%; HAT-CN/NPB结构的PN结有效地降低了器件的启亮电压(2.7 V), 将OLED器件的EQE提高到5.76%; HAT-CN的加入提高了器件的空穴迁移率, 降低了单空穴器件的阻抗。TADF材料作为主体材料在提高OLED器件的光电性能方面具有很大的潜力。
热活化延迟荧光材料 单空穴器件 阻抗谱 thermally activated delayed fluorescent (TADF) TADF-OLED TADF-OLED device structure hole only devices impedance spectrum
Author Affiliations
Abstract
1 Department of Chemical and Chemical Engineering, Hefei Normal University, Hefei 230601, China
2 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
In this paper, the effects of three types of commonly used adhesives were studied via experiment and simulation. The results show that the strain sensitivity of fiber Bragg grating (FBG) sensor is about 1.201 pm/με and the effects of three adhesives of epoxy resin, AB glue and 502 glue with the same thickness and length on sensitivity coefficients of FBG sensors are 99.20%, 93.80% and 96.50%, respectively. Finally, the sensitivity coefficient of the simulated FBG sensor is the same as the test result by ANSYS modeling.
光电子快报（英文版）
2019, 15(4): 264
