Managing Intersegmental Charge-Transfer and Multiple Resonance Alignments of D3-A Typed TADF Emitters for Red OLEDs with Improved Efficiency and Color Purity,Advanced Optical Materials

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Managing Intersegmental Charge-Transfer and Multiple Resonance Alignments of D3-A Typed TADF Emitters for Red OLEDs with Improved Efficiency and Color Purity
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-11-28 , DOI: 10.1002/adom.202101789
Xiao‐Chun Fan ₁ , Kai Wang ₁ , Yi‐Zhong Shi ₁ , Jia‐Xiong Chen _{1,

2} , Feng Huang ₁ , Hui Wang ₁ , Ya‐Nan Hu ₁ , Youichi Tsuchiya ₃ , Xue‐Mei Ou ₁ , Jia Yu ₁ , Chihaya Adachi ₃ , Xiao‐Hong Zhang ₁

Affiliation

Thermally activated delayed fluorescence (TADF) emitters induced by the multiple resonance (MR) effect have garnered considerable attention. However, it is difficult to develop MR-TADF emitters that maintain high color purities in the red region. In this work, the importance of excited state alignments of MR-based donor-acceptor (D-A) molecules in determining their preferring characteristics is clarified. By using the newly designed molecule mBDPA-TOAT whose apparent excited states show hybridization of MR and intersegmental charge-transfer features as an emitter in an organic light-emitting diode (OLED), a high external quantum efficiency of 17.3% is achieved with a full width at half-maximum of 45 nm (154 meV) and Commission Internationale de L'Éclairage coordinate of (0.61, 0.39). This work demonstrates when introducing D-A typed structures, features, and alignments of molecular excited states determine ultimate material properties. This could help to develop high efficiency and high color purity TADF emitters toward long wavelength range.

中文翻译：

管理用于红色 OLED 的 D3-A 型 TADF 发射器的段间电荷转移和多重共振对准，提高效率和颜色纯度

由多重共振（MR）效应引起的热激活延迟荧光（TADF）发射器引起了广泛关注。然而，很难开发在红色区域保持高颜色纯度的 MR-TADF 发射器。在这项工作中，阐明了基于 MR 的供体 - 受体 (DA) 分子的激发态排列在确定其偏好特性中的重要性。通过使用新设计的分子m BDPA-TOAT其表观激发态显示MR杂化和段间电荷转移特征作为有机发光二极管（OLED）中的发射器，在半峰全宽为45 nm时实现了17.3%的高外部量子效率（ 154 meV) 和 Commission Internationale de L'Éclairage 坐标 (0.61, 0.39)。这项工作表明，当引入 DA 型结构、特征和分子激发态的排列决定最终材料特性时。这有助于开发长波长范围的高效率和高色纯度 TADF 发射器。

更新日期：2021-11-28

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