A blue thermally activated delayed fluorescence emitter developed by appending a fluorene moiety to a carbazole donor with meta-linkage for high-efficiency OLEDs,Materials Chemistry Frontiers

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A blue thermally activated delayed fluorescence emitter developed by appending a fluorene moiety to a carbazole donor with meta-linkage for high-efficiency OLEDs
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-02-05 00:00:00 , DOI: 10.1039/c7qm00605e
Jiao-Jiao Liang _{1,

2,

3,

4,

5} , Yun Li _{1,

2,

3,

4,

5} , Yi Yuan _{1,

2,

3,

4,

5} , Si-Hua Li _{1,

2,

3,

4,

5} , Xiang-Dong Zhu _{1,

2,

3,

4,

5} , Stephen Barlow _{6,

7,

8,

9} , Man-Keung Fung _{1,

2,

3,

4,

5} , Zuo-Quan Jiang _{1,

2,

3,

4,

5} , Seth R. Marder _{6,

7,

8,

9} , Liang-Sheng Liao _{1,

2,

3,

4,

5}

Affiliation

A new thermally activated delayed fluorescence (TADF) emitter, 3-(9,9′-spirobi[fluoren]-6-yl)-9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9H-carbazole (SFCC), was developed for blue organic light-emitting diodes (OLEDs), and its thermal, photophysical and electrochemical properties were systematically investigated. Upon introducing a 9,9′-spiro-bifluorene group through its C3 position to the C3 position of carbazole, the resulting new backbone had a more delocalized highest occupied molecular orbital (HOMO) than carbazole itself which led to a higher photoluminescence quantum yield (PLQY) compared with that of the control material, 3-bromo-9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9H-carbazole (TRTZ). The OLED based on SFCC as the blue TADF emitter has a maximum external quantum efficiency (EQE) of 10.59%, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.17, 0.21), significantly surpassing the performance of the reference emitter TRTZ, indicating that the introduction of the 9,9′-spiro-bifluorene unit is a promising strategy for the modification of TADF materials.

中文翻译：

通过将芴部分附加到具有间位键的咔唑供体上而开发的蓝色热活化延迟荧光发射体，用于高效OLED

一种新的热激活延迟荧光（TADF）发射体3-（9,9'-spirobi [fluoren] -6-yl）-9-（4-（4,6-diphenyl-1,3,5-triazin-2 -基）苯基）-9 H-咔唑（SFCC）被开发用于蓝色有机发光二极管（OLED），并对其热，光物理和电化学性质进行了系统研究。在通过咔唑的C3位引入C3位置的9,9'-螺代二芴基团后，所产生的新骨架比咔唑本身具有更高的离域最高占据分子轨道（HOMO），从而导致更高的光致发光量子产率（ PLQY）与对照材料3-Bromo-9-（4-（4,6-diphenyl-1,3,5-triazin-2-yl）phenyl）-9 H-咔唑（TRTZ）进行比较。基于OLED作为蓝色TADF发射器的SFCC的最大外部量子效率（EQE）为10.59％，国际照明委员会（CIE）坐标为（0.17，0.21），大大超过了参考发射器TRTZ的性能，表明引入9,9'-螺二芴单元是一种用于TADF材料改性的有前途的策略。

更新日期：2018-02-05

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