Multiphotoluminescence from a Triphenylamine Derivative and Its Application in White Organic Light‐Emitting Diodes Based on a Single Emissive Layer,Advanced Materials

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Multiphotoluminescence from a Triphenylamine Derivative and Its Application in White Organic Light‐Emitting Diodes Based on a Single Emissive Layer
Advanced Materials ( IF 27.4 ) Pub Date : 2019-04-16 , DOI: 10.1002/adma.201900613
Xiaomeng Li _{1,

2} , Jieshun Cui ₁ , Qiankai Ba _{1,

3} , Zhe Zhang ₄ , Shaoqing Chen ₁ , Guoxin Yin ₁ , Yu Wang ₁ , Bobo Li ₂ , Guohong Xiang ₂ , Kwang Soo Kim ₃ , Hu Xu ₄ , Zhaoyu Zhang ₂ , Hsing‐Lin Wang ₁

Affiliation

White organic light‐emitting diode (WOLED) technology has attracted considerable attention because of its potential use as a next‐generation solid‐state lighting source. However, most of the reported WOLEDs that employ the combination of multi‐emissive materials to generate white emission may suffer from color instability, high material cost, and a complex fabrication procedure which can be diminished by the single‐emitter‐based WOLED. Herein, a color‐tunable material, tris(4‐(phenylethynyl)phenyl)amine (TPEPA), is reported, whose photoluminescence (PL) spectrum is altered by adjusting the thermal annealing temperature nearly encompassing the entire visible spectra. Density functional theory calculations and transmission electron microscopy results offer mechanistic understanding of the PL redshift resulting from thermally activated rotation of benzene rings and rotation of 4‐(phenylethynyl) phenyl)amine connected to the central nitrogen atom that lead to formation of ordered molecular packing which improves the π–π stacking degree and increases electronic coupling. Further, by precisely controlling the annealing time and temperature, a white‐light OLED is fabricated with the maximum external quantum efficiency of 3.4% with TPEPA as the only emissive molecule. As far as it is known, thus far, this is the best performance achieved for single small organic molecule based WOLED devices.

中文翻译：

三苯胺衍生物的多光致发光及其在基于单个发光层的白色有机发光二极管中的应用

白色有机发光二极管（WOLED）技术由于可能用作下一代固态光源而备受关注。但是，大多数报道的采用多发射材料组合产生白光的WOLED可能会遭受颜色不稳定性，高材料成本以及复杂的制造过程的困扰，而基于单发射极的WOLED可以减少这种复杂的制造过程。本文报道了一种颜色可调材料三（4-（苯基乙炔基）苯基）胺（TPEPA），其光致发光（PL）光谱通过调节几乎涵盖整个可见光谱的热退火温度而改变。密度泛函理论计算和透射电子显微镜结果提供了对由机械活化的苯环的热活化旋转和与中心氮原子连接的4-（苯基乙炔基）苯基）胺的旋转所导致的PL红移的机理的理解，从而导致形成有序的分子堆积提高了π-π的堆积度并增加了电子耦合。此外，通过精确控制退火时间和温度，以TPEPA作为唯一的发射分子，可以制造出最大外部量子效率为3.4％的白光OLED。到目前为止，这是单个基于有机小分子的WOLED器件实现的最佳性能。

更新日期：2019-04-16

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