Strategically Modulating Carriers and Excitons for Efficient and Stable Ultrapure‐Green Fluorescent OLEDs with a Sterically Hindered BODIPY Dopant,Advanced Optical Materials

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Strategically Modulating Carriers and Excitons for Efficient and Stable Ultrapure‐Green Fluorescent OLEDs with a Sterically Hindered BODIPY Dopant
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-05-14 , DOI: 10.1002/adom.202000483
Xiaozeng Song ₁ , Dongdong Zhang ₁ , Yuewei Zhang ₁ , Yang Lu ₁ , Lian Duan _{1,

2}

Affiliation

Ultrapure colors are vital for displays to obtain the highly desired wide color‐gamut. Till now, only boron‐dipyrromethene derivatives (BODIPYs) have demonstrated ultrapure full‐colors but suffer from low excitons utilization efficiency as dopants in organic light‐emitting diodes. It is proposed here that with a thermally activated delayed fluorophore to sensitize BODIPYs, all excitons can be recycled, which, still, is challenged by exciton loss through Dexter energy transfer (DET) from sensitizer to dopant and direct charge trapping on BODIPYs. Hence, a sterically hindered BODIPY‐type dopant with a bulk substituent on the meso‐position is developed to suppress DET, exhibiting a high photo‐luminance quantum yield of 98% and a small full width at half maximum of 28 nm. Moreover, the device structure is elaborately designed, successfully modulating carriers and excitons to avoid charge trapping on dopant and also trigger multiple‐sensitizing processes to reduce exciton loss. Consequently, a state‐of‐the‐art maximum external quantum efficiency/power efficiency of 19.0%/85.7 lm W⁻¹ are realized together with an ultrapure‐green emission of Commission Internationale de l'Eclairage coordinates of (0.26, 0.67) and a long half‐lifetime of 2947 h at an initial luminance of 1000 cd m⁻².

中文翻译：

具有战略意义的调制载流子和激子，以有效和稳定的BODIPY掺杂剂实现超纯绿色荧光OLED。

超纯色对于显示器获得高度期望的宽色域至关重要。到目前为止，只有硼二吡咯亚甲基衍生物（BODIPYs）表现出超纯全色，但作为有机发光二极管中的掺杂剂，其激子利用率低。在此提出，通过热活化的延迟荧光团使BODIPY敏化，所有激子都可以循环利用，但仍然受到通过从敏化剂到掺杂剂的德克斯特能量转移（DET）引起的激子损失的挑战，BODIPY上的电荷直接捕获。因此，开发了一种在位相上带有本体取代基的位阻BODIPY型掺杂剂，以抑制DET，其光致发光量子产率高达98％，半峰宽仅为28 nm，半峰很小。而且，设备结构精心设计，成功地调制了载流子和激子，以避免电荷被掺杂物俘获，并触发了多重敏化过程以减少激子损失。因此，最新的最大外部量子效率/功率效率为19.0％/ 85.7 lm W^-1与初始亮度1000 cd m ^-2的超纯绿色发射的国际照明委员会坐标（0.26，0.67）和较长的半衰期2947 h一起实现。

更新日期：2020-05-14

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