An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40% EQE,Advanced Functional Materials

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An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40% EQE
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-03-19 , DOI: 10.1002/adfm.202213056
Wei Yang _{1,

2} , Jingsheng Miao ₁ , Fengping Hu ₃ , Yang Zou ₁ , Cheng Zhong ₃ , Shaolong Gong ₃ , Chuluo Yang _{1,

3}

Affiliation

B/N-based multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters and the corresponding narrow band emissive organic light-emitting diodes (OLEDs) exhibit great potential for next-generation high-resolution displays. Nonetheless, designing MR-TADF emitters with emission wavelength over 550 nm remains challenging. Herein, an effective approach toward yellow-to-orange MR-TADF emitters by integrating a strong electron-donating indolophenazine building block into the B/N-doped polycyclic aromatic hydrocarbons is proposed. The investigation of photophysical properties reveals that the electron-donating difference between the donor segments of MR framework has a dramatic influence on the luminescent features, including the emission wavelength and full-width at half-maximum (FWHM). These TADF emitters display excellent photophysical characteristics such as near-unity photoluminescence quantum yields and almost 100% horizontal dipole ratio. As a result, yellow and orange OLEDs employing these emitters achieve state-of-the-art device performances with an ultrahigh external quantum efficiency of up to nearly 40%, power efficiency of 163 lm W⁻¹, and luminance close to 120 000 cd m⁻², which set a record among MR-TADF based OLEDs with emission peaks over 550 nm. More impressively, the fabricated device presents outstanding operational stability of LT₉₉ over 110 h at the initial brightness of 3000 cd m⁻².

中文翻译：

通过将强电子供体集成到基于 B/N 的多环结构中实现黄色至橙色多共振 TADF 发射器的有效方法：具有近 40% EQE 的高性能 OLED

基于 B/N 的多共振热激活延迟荧光 (MR-TADF) 发射器和相应的窄带发射有机发光二极管 (OLED) 在下一代高分辨率显示器方面具有巨大潜力。尽管如此，设计发射波长超过 550 nm 的 MR-TADF 发射器仍然具有挑战性。在此，提出了一种通过将强供电子吲哚吩嗪结构单元集成到 B/N 掺杂的多环芳烃中来制备黄色至橙色 MR-TADF 发射体的有效方法。光物理性质的研究表明，MR 框架供体段之间的供电子差异对发光特性具有显着影响，包括发射波长和半峰全宽 (FWHM)。这些 TADF 发射器显示出出色的光物理特性，例如接近统一的光致发光量子产率和几乎 100% 的水平偶极子比。因此，采用这些发射器的黄色和橙色 OLED 实现了最先进的器件性能，具有高达近 40% 的超高外部量子效率，163 lm W 的功率效率^-1，亮度接近120 000 cd m ^-2，这在基于MR-TADF的OLED中创下了发射峰超过550 nm的记录。更令人印象深刻的是，所制造的器件在 3000 cd m ^-2的初始亮度下表现出 LT ₉₉超过 110 小时的出色运行稳定性。

更新日期：2023-03-19

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