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Efficient Deep-Blue Multiple-Resonance Emitters Based on Azepine-Decorated ν-DABNA for CIEy below 0.06
Advanced Materials ( IF 27.4 ) Pub Date : 2024-05-02 , DOI: 10.1002/adma.202402905 Masashi Mamada 1 , Akio Aoyama 2 , Ryota Uchida 1 , Junki Ochi 1 , Susumu Oda 3 , Yasuhiro Kondo 4 , Masakazu Kondo 5 , Takuji Hatakeyama 1
Advanced Materials ( IF 27.4 ) Pub Date : 2024-05-02 , DOI: 10.1002/adma.202402905 Masashi Mamada 1 , Akio Aoyama 2 , Ryota Uchida 1 , Junki Ochi 1 , Susumu Oda 3 , Yasuhiro Kondo 4 , Masakazu Kondo 5 , Takuji Hatakeyama 1
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Ultrapure deep-blue emitters are in high demand for organic light-emitting diodes (OLEDs). Although color coordinates serve as straightforward parameters for assessing color purity, precise control over the maximum wavelength and full-width at half-maximum is necessary to optimize OLED performance, including luminance efficiency and luminous efficacy. Multiple-resonance (MR) emitters are promising candidates for achieving ideal luminescence properties; consequently, a wide variety of MR frameworks have been developed. However, most of these emitters experience a wavelength displacement from the ideal color, which limits their practical applicability. Therefore, a molecular design that is compatible with MR emitters for modulating their energy levels and color output is particularly valuable. Here, it is demonstrated that the azepine donor unit induces an appropriate blue-shift in the emission maximum while maintaining efficient MR characteristics, including high photoluminescence quantum yield, narrow emission, and a fast reverse intersystem crossing rate. OLEDs using newly developed MR emitters based on the ν-DABNA framework simultaneously exhibit a high quantum efficiency of ≈30%, luminous efficacy of ≈20 lm W−1, exceptional color purity with Commission Internationale de l’Éclairage coordinates as low as (0.14, 0.06), and notably high operational stability. These results demonstrate unprecedentedly high levels compared with those observed in previously reported deep-blue emitters.
中文翻译：
基于氮杂卓修饰的 ν-DABNA 的高效深蓝色多谐振发射器，CIEy 低于 0.06
有机发光二极管 (OLED) 对超纯深蓝色发射器的需求量很大。尽管色坐标是评估色纯度的直接参数，但为了优化 OLED 性能（包括发光效率和发光效率），需要精确控制最大波长和半峰全宽。多共振（MR）发射器是实现理想发光特性的有希望的候选者；因此，各种各样的MR框架被开发出来。然而，大多数这些发射器都会经历与理想颜色的波长偏移，这限制了它们的实际适用性。因此，与MR发射器兼容以调节其能量水平和颜色输出的分子设计特别有价值。在这里，证明氮杂苯供体单元在发射最大值中引起适当的蓝移，同时保持有效的MR特性，包括高光致发光量子产率、窄发射和快速反向系间窜越率。使用基于ν -DABNA框架的新开发的 MR 发射器的 OLED 同时表现出约 30% 的高量子效率、约 20 lm W -1的发光效率、出色的色纯度，国际照明委员会坐标低至 (0.14 ，0.06），并且运行稳定性特别高。与之前报道的深蓝色发射器中观察到的结果相比，这些结果显示出前所未有的高水平。
更新日期：2024-05-02
中文翻译：
基于氮杂卓修饰的 ν-DABNA 的高效深蓝色多谐振发射器，CIEy 低于 0.06
有机发光二极管 (OLED) 对超纯深蓝色发射器的需求量很大。尽管色坐标是评估色纯度的直接参数，但为了优化 OLED 性能（包括发光效率和发光效率），需要精确控制最大波长和半峰全宽。多共振（MR）发射器是实现理想发光特性的有希望的候选者；因此，各种各样的MR框架被开发出来。然而，大多数这些发射器都会经历与理想颜色的波长偏移，这限制了它们的实际适用性。因此，与MR发射器兼容以调节其能量水平和颜色输出的分子设计特别有价值。在这里，证明氮杂苯供体单元在发射最大值中引起适当的蓝移，同时保持有效的MR特性，包括高光致发光量子产率、窄发射和快速反向系间窜越率。使用基于ν -DABNA框架的新开发的 MR 发射器的 OLED 同时表现出约 30% 的高量子效率、约 20 lm W -1的发光效率、出色的色纯度，国际照明委员会坐标低至 (0.14 ，0.06），并且运行稳定性特别高。与之前报道的深蓝色发射器中观察到的结果相比，这些结果显示出前所未有的高水平。
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