Lee Jian Haur, Lin Hung-Yi, Chen Chia-Hsun, Lee Yi-Ting, Chiu Tien-Lung, Lee Jiun-Haw, Chen Chin-Ti, Adachi Chihaya
Sustainable Chemical Science and Technology, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan.
Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34605-34615. doi: 10.1021/acsami.1c07859. Epub 2021 Jul 15.
A novel bis-4Ph-substituted 9,10-dipehnylanthracene deep blue [1931 CIE (0.15, 0.08)] fluorescent compound, , has been synthesized and characterized for organic light-emitting diode (OLED) applications. Our experimental study of excludes the possibility of triplet-triplet annihilation, hybridized local and charge transfer, or thermally activated delayed fluorescent characteristics of the material. Since the solid-state photoluminescence quantum yield of was determined to be 48%, assuming a 100% for the charge recombination efficiency, the light outcoupling efficiency (η) of an non-doped OLED achieving an external quantum efficiency (EQE) of 5.3% is at least 44%, which is more than twofold higher than 20% for conventional OLEDs. Both grazing incidence wide-angle X-ray scattering (GIWAXS) and angle-dependent photoluminescence (ADPL) measurements reveal having a high value of order parameter () of 0.61 for a ππ stacking along the normal direction and an orientation order parameter () for a horizontal emitting dipole moment of -0.50 or Θ (horizontal-dipole ratios) of 100%, respectively. Otherwise, a refractive index () measurement provides a = 1.80 for thin films. Based on η = 1.2 × , the calculated η is 37%, which is also in accordance with the results of GIWAXS and ADPL. We have also fabricated the classical fluorescent -doped OLEDs, which display a true blue [1931 CIE (0.15 and 0.16)] electroluminescence with a high efficiency (EQE = 6.9%), surpassing the conventional ∼5% EQE. Based on an η of 42% for -doped OLEDs, our studies suggest that the extremely horizontally aligned host material exerts the same horizontal alignment on the dopant molecules.
一种新型的双-4Ph取代的9,10-二苯基蒽深蓝色[1931 CIE (0.15, 0.08)]荧光化合物，已被合成并针对有机发光二极管（OLED）应用进行了表征。我们对该化合物的实验研究排除了三重态-三重态湮灭、杂化局域和电荷转移或该材料热激活延迟荧光特性的可能性。由于该化合物的固态光致发光量子产率被确定为48%，假设电荷复合效率为100%，则实现5.3%外部量子效率（EQE）的非掺杂OLED的光出射耦合效率（η）至少为44%，这比传统OLED的20%高出两倍多。掠入射广角X射线散射（GIWAXS）和角度相关光致发光（ADPL）测量均表明，该化合物沿法线方向的ππ堆积的有序参数（S）值为0.61，水平发射偶极矩的取向有序参数（Sθ）为-0.50或水平偶极比（Θ）为100%。此外，折射率（n）测量得出该化合物薄膜的n = 1.80。基于η = 1.2 × ，计算得出的η为37%，这也与GIWAXS和ADPL的结果一致。我们还制备了经典的荧光掺杂OLED，其显示出真正的蓝色[1931 CIE (0.15和0.16)]电致发光，效率很高（EQE = 6.9%），超过了传统的约5%的EQE。基于掺杂OLED的42%的η，我们的研究表明，极度水平排列的主体材料对掺杂分子施加了相同的水平排列。
