Approaches for white organic light-emitting diode via solution-processed blue and yellow TADF emitters: Charge balance and host-guest interactions in a single emission layer

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2025-02-01 DOI:10.1016/j.orgel.2024.107175

Emmanuel Santos Moraes, José Carlos Germino, Luiz Pereira

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Although OLEDs are widely employed nowadays for display technology devices, their application for room-lighting illumination remains a challenge due to the cost-effectiveness issues, mainly related to device fabrication. In this sense, the present study investigates the optimization of blue-emitting TADF (DMOC-DPS) and yellow-emitting TADF (TXO-TPA) compounds in solution-processed OLEDs to achieve efficient white light emission in a two-organic layer device. Four different host materials were studied, aiming to balance the charge mobility of holes and electrons. The host materials used include (in %wt.) a 1:1 mixture of mCP and DPEPO (HOST1), a 3:2 mixture of PVK and DPEPO (HOST2), a 3:2 mixture of PVK and mCP (HOST3), and a 3:2 mixture of PVK and butyl-PBD (HOST4). The experimental results obtained from the solution-processed OLEDs indicate that DMOC-DPS is predominantly a hole transport material, and hosts with predominantly n-type character, such as HOST1 and HOST4, resulting in the most efficient white-OLEDs by the most balanced charge mobility. With structure optimization, WOLEDs achieved 6.43 % EQE with a brightness of 2621 cd/m² (not integrated) and 6.06 % EQE with a brightness of 1986 cd/m² for HOST4 and HOST1, respectively. The emission characteristics were influenced by host materials characteristics, with blue and yellow emissions being fine-tuned to produce complementary colors. This study highlights the critical role of charge mobility balance in the emissive layer and demonstrates the potential of independently optimizing blue and yellow TADF components for high-performance WOLEDs suitable for indoor lighting applications.

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通过溶液处理的蓝色和黄色TADF发射器制备白色有机发光二极管的方法：单发射层中的电荷平衡和主客体相互作用

下载：下载高清图片下载：下载全尺寸图片尽管oled如今已广泛应用于显示技术设备，但由于成本效益问题（主要与设备制造有关），其在室内照明中的应用仍然是一个挑战。在此意义上，本研究探讨了溶液处理oled中蓝色发射TADF （DMOC-DPS）和黄色发射TADF （TXO-TPA）化合物的优化，以实现双有机层器件中高效的白光发射。研究了四种不同的主体材料，旨在平衡空穴和电子的电荷迁移率。使用的宿主材料包括（以%wt计）1:1的mCP和DPEPO混合物（HOST1）， 3:2的PVK和DPEPO混合物（HOST2）， 3:2的PVK和mCP混合物（HOST3），以及3:2的PVK和丁基pbd混合物（HOST4）。溶液处理oled的实验结果表明，DMOC-DPS主要是一种空穴输运材料，而HOST1和HOST4等寄主则主要是n型寄主，以最平衡的电荷迁移率生成效率最高的白色oled。经过结构优化，HOST4和HOST1的EQE分别达到6.43%和6.06%，亮度为2621 cd/m2（未集成），亮度为1986 cd/m2。发射特性受主体材料特性的影响，蓝色和黄色的发射被微调以产生互补色。这项研究强调了电荷迁移平衡在发射层中的关键作用，并展示了独立优化蓝色和黄色TADF组件用于适合室内照明应用的高性能WOLEDs的潜力。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.