Blue light-emitting and hole-transporting materials based on 9,9-bis(4-diphenylaminophenyl)fluorenes for efficient electroluminescent devices
摘要:
新型双功能材料BTTF、TPTF和BPTF以9,9-bis(4-diphenylaminophenyl)fluorene为分子平台进行合成和表征。这些分子在溶液和固态中均表现出强烈的蓝色发光,溶液荧光量子效率高达74%,且具有热稳定性,玻璃转变温度远高于170°C。这些材料作为蓝光发射材料在蓝色OLED和作为绿色OLED的载流子传输材料的器件性能和热属性方面,均优于常用的N,N′-二苯基-N,N′-二(1-萘基)-(1,1′-联苯)-4,4′-二胺(NPB)。使用BPTF作为发光层和载流子传输层,分别实现了高效无掺杂的蓝色OLED和基于Alq3的绿色OLED,其最大亮度效率和CIE坐标分别为2.06 cd A−1和(0.15, 0.13),以及4.94 cd A−1和(0.29, 0.52)。
New bifunctional materials namely BTTF, TPTF and BPTF having 9,9-bis(4-diphenylaminophenyl)fluorene as a molecular platform were synthesized and characterized. These molecules showed strong blue emission in both solution and solid state with a solution fluorescence quantum efficiency of up to 74% and were thermally stable amorphous materials with glass transition temperature well above 170 °C. The abilities of these materials as blue light-emitting materials for blue OLEDs and hole-transporting materials for green OLEDs in terms of device performance and thermal property were superior to a commonly used N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine (NPB). Efficient non-doped blue and Alq3-based green OLEDs with maximum luminance efficiencies and CIE coordinates of 2.06 cd A−1 and (0.15, 0.13), and 4.94 cd A−1 and (0.29, 0.52) were achieved, respectively, with BPTF having two pyrene substituents as the emitting layer and the hole-transporting layer, respectively.
新型双功能材料BTTF、TPTF和BPTF以9,9-bis(4-diphenylaminophenyl)fluorene为分子平台进行合成和表征。这些分子在溶液和固态中均表现出强烈的蓝色发光,溶液荧光量子效率高达74%,且具有热稳定性,玻璃转变温度远高于170°C。这些材料作为蓝光发射材料在蓝色OLED和作为绿色OLED的载流子传输材料的器件性能和热属性方面,均优于常用的N,N′-二苯基-N,N′-二(1-萘基)-(1,1′-联苯)-4,4′-二胺(NPB)。使用BPTF作为发光层和载流子传输层,分别实现了高效无掺杂的蓝色OLED和基于Alq3的绿色OLED,其最大亮度效率和CIE坐标分别为2.06 cd A−1和(0.15, 0.13),以及4.94 cd A−1和(0.29, 0.52)。