CN engineered electron transport type hosts for high efficiency and extended lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes,Journal of Materials Chemistry C

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CN engineered electron transport type hosts for high efficiency and extended lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-1-4 , DOI: 10.1039/d0tc05662f
Sung Yong Byeon _{1,

2,

3,

4} , Kyung Hyung Lee _{1,

2,

3,

4} , Jun Yeob Lee _{1,

2,

3,

4}

Affiliation

Electron transport type host materials for blue thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs) were synthesized by engineering the electron withdrawing CN units in the molecular structure. The two host materials having twisted molecular structure by ortho orientation of dibenzofuran and CN modified carbazole were developed as the electron transport type hosts to obtain high triplet energy for blue TADF application. Two CN units were introduced in the molecular structure for electron transport properties. One host had one CN unit in the phenyl core and one CN unit in the carbazole, and the other host had two CN units in the carbazole. The two hosts showed similar triplet energy above 3.0 eV, but different lowest unoccupied molecular orbital (LUMO) energy levels and orbital distributions. The host with one CN unit in the phenyl core showed superior device performances such as EQE over 20% and device lifetime of 32.2 h up to 80% of initial luminance of 500 cd m⁻² as the electron transport type host in the mixed host because of deep LUMO level suppressing electron trapping.

中文翻译：

CN设计的电子传输类型主机，可在蓝色热激活延迟荧光有机发光二极管中提高效率并延长使用寿命

通过在分子结构中设计吸电子CN单元，合成了用于蓝色热激活延迟荧光（TADF）有机发光二极管（OLED）的电子传输型主体材料。开发了通过二苯并呋喃和CN改性咔唑的邻位取向而具有扭曲的分子结构的两种主体材料作为电子传输型主体，从而获得了用于蓝色TADF的高三线态能量。在分子结构中引入了两个CN单元以提高电子传输性能。一个主体在苯基核中具有一个CN单元，在咔唑中具有一个CN单元，另一主体在咔唑中具有两个CN单元。两种宿主在3.0 eV以上显示出相似的三重态能量，但在最低的未占据分子轨道（LUMO）能量水平和轨道分布方面存在差异。由于深的LUMO能级抑制了电子俘获，因此在混合主体中作为电子传输型主体^-2。

更新日期：2021-01-15

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