Narrowband emitters offer significant advantages in the fabrication of next-generation deep-blue organic light-emitting diodes (OLEDs) due to their wide color gamut, high stability, and high efficiency. It is a pressing challenge to increase the light outcoupling efficiency to further boost device performance, even though 100% internal quantum efficiency is already achievable through rational molecular design. Here, we strategically propose a novel asymmetric structure design strategy aimed at simultaneously optimizing the horizontal emitting dipole orientation and aggregation state properties of the deep-blue multi-resonance (MR) emitters. This proof-of-concept emitter A-BN is capable of displaying ultrapure deep-blue emission with a peak of ∼461 nm, a small full-width-at-half-maximum of ∼25 nm, a CIEy coordinate of ∼0.08, a high horizontal dipole ratio of ∼90 %, and a near-unity photoluminescence quantum yield of ∼98 % in the practical mass-production concentration range (1–3 wt%). The corresponding non-sensitized device achieves a maximum external quantum efficiency of 41.5% without any external light extraction techniques, representing state-of-the-art performance for deep-blue OLEDs. These findings will help drive the development of highly efficient and stable narrowband deep-blue emitters and lead to a revolution in OLED technology.

中文翻译：

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高度定向多谐振发射器的不对称结构设计使深蓝色OLED的外部量子效率达到创纪录的41.5%

窄带发射器因其宽色域、高稳定性和高效率而在下一代深蓝色有机发光二极管（OLED）的制造中具有显着的优势。尽管通过合理的分子设计已经可以实现 100% 的内量子效率，但提高光输出耦合效率以进一步提高器件性能仍然是一个紧迫的挑战。在这里，我们战略性地提出了一种新颖的不对称结构设计策略，旨在同时优化深蓝色多谐振（MR）发射器的水平发射偶极子方向和聚集态特性。这种概念验证发射器 A-BN 能够显示超纯深蓝色发射，峰值为 ∼461 nm，半高全宽为 ∼25 nm，CIEy 坐标为 ∼0.08，在实际量产浓度范围（1-3 wt%）内，水平偶极子比率高达~90%，光致发光量子产率接近一致~98%。相应的非敏化器件在没有任何外部光提取技术的情况下实现了 41.5% 的最大外部量子效率，代表了深蓝色 OLED 的最先进性能。这些发现将有助于推动高效、稳定的窄带深蓝色发射器的发展，并引发OLED技术的革命。