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Triple-doped white organic light-emitting devices grown in vacuum

机译:真空生长的三掺杂白色有机发光器件

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We demonstrate efficient (η_p=11+-1 lm/W at 1000 cd/m~2), bright electrophosphorescent white organic light emitting devices (WOLEDs) employing three dopants in a 9-nm-thick inert host matrix. The emissive layer consists of 2 wt.% indium (Ⅲ) bis(2-phenyl quinolyl-N,C~(2′)) acetylacetonate (PQIr), 0.5 wt.% fac-tris(2-phenylpyridine) iridium (Ir(ppy)_3) and 20 wt.% bis(4',6'-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6) co-doped hito a wide energy gap p-bis(triphenylsilyly)benzene (UGH2) host. Devices were characterized in terms relevant to both display and general lighting applications, and have a peak total power efficiency of 42+-4 lm/W at low intensities, falling to 10+-1 lm/W at a drive current of 20 mA/cm~2 (corresponding to 1.4 lm/cm~2 for an isotropic illumination source). The Commission Internationale de PEclairage coordinates shift from (0.43,45) at 0.1 mA/cm to (0.38,0.45) at 10 mA/cm~2, and a color rendering index >75 is obtained. Three factors contribute to the high efficiency: thin layers leading to low voltage operation, a high quantum efficiency blue dopant, and efficient confinement of charge and excitons within the emissive region. The highest occupied and lowest unoccupied energy levels of component layers will be discussed to elucidate charge and exciton confinement within the emissive layer. Additionally, we will explain energy transfer between dopants based on photoluminescent transient analysis of triple-doped thin films.
机译:我们展示了一种有效的方法(在1000 cd / m〜2时η_p= 11 + -1 lm / W),明亮的电致磷光白色有机发光器件(WOLED)在9纳米厚的惰性基质中采用了三种掺杂剂。发射层由2重量%的铟(Ⅲ)双(2-苯基喹啉基-N,C〜(2'))乙酰丙酮化物(PQIr),0.5重量%的fac-tris(2-苯基吡啶)铱(Ir( ppy)_3)和20 wt。%的双(4',6'-二氟苯基吡啶基氨基)四(1-吡唑基)硼酸酯(FIr6)共掺杂了宽能隙的对双(三苯基甲硅烷基)苯(UGH2)主体。器件具有与显示和一般照明应用相关的特性,在低强度下具有42 + -4 lm / W的峰值总功率效率,在20 mA /驱动电流下降至10 + -1 lm / W。 cm〜2(对于各向同性照明源,对应于1.4 lm / cm〜2)。国际体育委员会的坐标从0.1 mA / cm〜2的(0.43,45)变为10 mA / cm〜2的(0.38,0.45),并且显色指数> 75。导致高效率的三个因素:导致低压工作的薄层,高量子效率的蓝色掺杂剂以及有效限制发射区域内的电荷和激子。将讨论组成层的最高占用和最低未占用能级,以阐明发射层内的电荷和激子约束。此外,我们将基于三重掺杂薄膜的光致发光瞬态分析来解释掺杂剂之间的能量转移。

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