Highly efficient deep-blue emitting organic light emitting diode based on the multifunctional fluorescent molecule comprising covalently bonded carbazole and anthracene moieties
作者:Se Hun Kim、Illhun Cho、Mun Ki Sim、Sanghyuk Park、Soo Young Park
DOI:10.1039/c1jm11111f
日期:——
High performance deep-blue organic light-emitting diodes (OLEDs) have been investigated using new multifunctional blue emitting materials 3-(anthracen-9-yl)-9-ethyl-9H-carbazole (AC), 3,6-di(anthracen-9-yl)-9-ethyl-9H-carbazole (DAC), 3-(anthracen-9-yl-)-9-phenyl-9H-carbazole (P-AC), and 3,6-di(anthracen-9-yl)-9-phenyl-9H-carbazole (P-DAC) which comprise covalently bonded carbazole and anthracene moieties. We also have investigated the thermal, electrochemical, and morphological stability to find suitable molecular structure, consisting of carbazole and anthracene moieties. The non-doping deep-blue OLEDs using P-DAC, which showed the highest thermal, electrochemical, and morphological stability, proved the highest luminance efficiency and external quantum efficiency of 3.14 cd A−1 and 2.75%, with the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates (0.162, 0.136) at 100 mA cm−2. Moreover, the doping devices using P-DAC as the host material showed blue emission, and the high luminance efficiencies and external quantum efficiencies of as high as 7.70 cd A−1 and 4.86% with CIE chromaticity coordinates (0.156, 0.136) and (0.156, 0.217) at 100 mA cm−2. Both the non-doping and doping devices using P-DAC uniquely exhibited high operational stability with virtually negligible efficiency roll-off over the broad current density range.
研究人员使用新型多功能蓝光发射材料研究了高性能深蓝色有机发光二极管(OLEDs)。这些材料包括:
- 3-(蒽-9-基)-9-乙基-9H-咔唑(AC)
- 3,6-二(蒽-9-基)-9-乙基-9H-咔唑(DAC)
- 3-(蒽-9-基)-9-苯基-9H-咔唑(P-AC)
- 3,6-二(蒽-9-基)-9-苯基-9H-咔唑(P-DAC)
这些材料由共价键合的咔唑和蒽基团组成。研究人员还研究了它们的热稳定性、电化学稳定性和形态稳定性,以找到合适的分子结构。
使用热稳定性、电化学稳定性和形态稳定性最高的P-DAC制备的非掺杂深蓝色OLED,在100 mA cm−2电流密度下:
- 发光效率达到3.14 cd A−1
- 外量子效率达到2.75%
- CIE色坐标为(0.162, 0.136)
以P-DAC为主体材料的掺杂器件在100 mA cm−2电流密度下:
- 发光效率高达7.70 cd A−1
- 外量子效率高达4.86%
- CIE色坐标为(0.156, 0.136)和(0.156, 0.217)
使用P-DAC的非掺杂和掺杂器件都表现出优异的操作稳定性,在较宽的电流密度范围内几乎没有效率衰减。