A series of blue fluorescent emitters based on triphenylene derivatives were synthesized via the Diels-Alder reaction in moderate yields. The electronic absorption and emission characteristics of the new functional materials were affected by the nature of the substituent on the triphenylene nucleus. Multilayered OLEDs were fabricated with a device structure of: ITO/NPB (50 nm)/EML (30 nm)/Bphen (30 nm)/Liq (2.0 nm)/Al (100 nm). All devices showed efficient blue emissions. Among those, a device using 1 gives the best performances with a high brightness (978 cd $m^-2}$ at 8.0 V) and high efficiencies (a luminous efficiency of 0.80 cd/A, a power efficiency of 0.34 lm/W and an external quantum efficiency of 0.73% at 20 $mA/cm^2$). The peak wavelength of the electroluminescence was 455 nm with CIEx,y coordinates of (0.17, 0.14) at 8.0 V.
通过 Diels-Alder 反应,以中等产率合成了一系列基于三亚苯衍
生物的蓝色荧光发射体。新功能材料的电子吸收和发射特性受到三亚苯核上取代基性质的影响。多层有机发光二极管的器件结构为ITO/NPB(50 nm)/
EML(30 nm)/
Bphen(30 nm)/Liq(2.0 nm)/Al(100 nm)。所有器件都显示出高效的蓝色发射。其中,使用 1 的器件性能最佳,亮度高(8.0 V 时为 978 cd
$m^-2}$),效率高(20
$mA/cm^2时的发光效率为 0.80 cd/A,功率效率为 0.34 lm/W,外部量子效率为 0.73%)。在 8.0 V 电压下,电致发光的峰值波长为 455 nm,CIEx、y 坐标为 (0.17, 0.14)。