Acceptor modification of diindolocarbazole embedded multiple-resonance emitters for efficient narrowband deep-blue OLEDs with CIEy ≤ 0.08 and alleviated efficiency roll-off,Journal of Materials Chemistry C

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Acceptor modification of diindolocarbazole embedded multiple-resonance emitters for efficient narrowband deep-blue OLEDs with CIEy ≤ 0.08 and alleviated efficiency roll-off
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2024-01-08 , DOI: 10.1039/d3tc03808d
Shuxin Wang _{1,

2} , Jianping Zhou ₃ , Jibiao Jin _{1,

2} , Minqiang Mai ₃ , Chui-Shan Tsang ₁ , Lawrence Yoon Suk Lee ₁ , Lian Duan ₃ , Wai-Yeung Wong _{1,

2}

Affiliation

Diindolocarbazole embedded multiple-resonance emitters have shown unique advantages in achieving narrowband deep-blue organic lighting emitting diodes (OLEDs). However, the severe efficiency roll-off still challenges their further applications. Herein, two efficient narrowband deep-blue emitters, pICz-PPO and pICz-2PPO, are designed and synthesized via an acceptor modification strategy to optimize the charge carrier mobility and thus the efficiency roll-off issue is addressed. Both emitters show narrowband deep-blue emission with narrow full width at half maximum (FWHM), high efficiency, and excellent color purity. The pICz-2PPO device exhibits a high maximum external quantum efficiency (EQE_max) of 17.7% and pure deep-blue emission peaking at 441 nm with a narrow FWHM of 24 nm and CIE coordinates of (0.16, 0.07). More importantly, the significantly alleviated efficiency roll-off is achieved by taking advantage of the balanced charge carrier mobility introduced by the PPO unit with excellent electron-transporting ability, manifesting that the appropriate charge carrier mobility modification can validly suppress the efficiency roll-off without the sacrifice of the efficiency and color purity. Surprisingly, the pICz-2PPO device exhibits the highest EQE of 12.8% amongst all the reported deep-blue devices based on pICz derivatives (below 10%) at an equivalent brightness of 100 cd m⁻². This work provides guidance to develop efficient multiple-resonance materials for OLEDs with low efficiency roll-off.

中文翻译：

二吲哚并咔唑嵌入多谐振发射器的受主修饰，可实现 CIEy ≤ 0.08 的高效窄带深蓝色 OLED 并减轻效率滚降

二吲哚并咔唑嵌入式多谐振发射器在实现窄带深蓝色有机发光二极管（OLED）方面显示出独特的优势。然而，严重的效率下降仍然挑战着它们的进一步应用。在此，通过受体修饰策略设计并合成了两种高效窄带深蓝色发射器pICz-PPO和pICz-2PPO，以优化载流子迁移率，从而解决了效率滚降问题。两种发射器均显示窄带深蓝色发射，具有窄半峰全宽 (FWHM)、高效率和出色的色纯度。pICz-2PPO 器件表现出高达 17.7% 的最大外量子效率 (EQE _max ) 和纯深蓝色发射峰，峰值波长为 441 nm，FWHM 窄为 24 nm，CIE 坐标为 (0.16, 0.07)。更重要的是，通过利用具有优异电子传输能力的PPO单元引入的平衡载流子迁移率，实现了显着缓解的效率滚降，这表明适当的载流子迁移率修改可以有效抑制效率滚降，而无需牺牲效率和色彩纯度。令人惊讶的是，在所有已报道的基于pICz衍生物的深蓝色器件中，pICz-2PPO器件在100 cd m ^-2的等效亮度下表现出最高的EQE（低于10%），达到12.8% 。这项工作为开发低效率滚降 OLED 的高效多谐振材料提供了指导。

更新日期：2024-01-08

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