摘要
基于新一代热活化延迟荧光(Thermally activated delayed fluorescence,TADF)发光材料的发光电化学池(Light-emitting electrochemical cells,LECs)成为新兴的研究方向而受到关注。由于TADF发光材料电荷分离态的激子属性,该类LECs器件发光光谱半峰宽往往达到100 nm以上,难以满足LEC高色纯度的需求。鉴于此,本文尝试将TADF敏化荧光(TADF-sensitized fluorescence,TSF)的激子管控策略应用到LECs领域当中。通过筛选合适的传输主体、TADF敏化剂、高吸光系数荧光染料和离子液体固态电解质为LEC的发光层,我们成功构建了高效TSF型的LECs器件。最终获得的TSF-LECs器件峰值外量子效率(The highest external quantum ef-ficiency,EQEmax)达到3.7%,峰值亮度(The peak luminance,Lmax)达到2285 cd·m^(-2)。与TADF-LECs的参比器件相比,TSF-LECs器件的光谱半峰宽(Full width at half maximum,FWHM)从106 nm降低至38 nm。本文还详细讨论了所制备TSF-LECs器件中的能量转移和激子损失途径。该工作为进一步优化设计TSF-LECs材料和器件奠定了基础。
Thermally activated delayed fluorescence(TADF)-type light-emitting electrochemical cells(TADF-LECs)have attracted much attention owing to their peculiar all-exciton-harvesting merits from purely organic materials.However,restricted by the property of charge-transfer excited state,almost all TADF-LECs displayed very broad electroluminescent spectra,e.g.a full width at half maximum(FWHM)as wide as 100 nm or more,which are difficult to meet the demands of high color purity.In view of this,this work attempts for the first time to construct LECs via TADF-sensitized fluorescence(TSF)strategy,i.e.TSF-LECs.The efficient TSF-LECs were successfully fabricated by selecting a suitable p-/n-doped host matrix,a nonionic TADF sensitizer,a fluorescent dye with high absorption coefficient and an ionic liquid solid-state electrolyte as the emissive layer of TSF-LEC.The energy transfer and exciton loss pathways in those TSF-LECs devices were further discussed in details.The as-fabricated TSF-LECs achieved high overall performance,that is reaching a peak external quantum efficiency(EQEmax)of 3.7% and a bright peak luminance(Lmax)of 2285 cd·m^(-2).Importantly,compared with the TADF-LEC reference device,the FWHM of TSF-LEC is reduced from 106 nm to 38 nm.This work will pave the road for further designing and constructing TSF-LECs both from material and device points of view.
作者
陈荔丝
蓝燕婷
赵小龙
秦冬冬
张玉微
陶春兰
张保华
牛利
CHEN Lisi;LAN Yanting;ZHAO Xiaolong;QIN Dongdong;ZHANG Yuwei;TAO Chunlan;ZHANG Baohua;NIU Li(Center for Advanced Analytical Science,Guangzhou Key Laboratory of Sensing Materials and Devices,Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Devices,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China;Key Laboratory of Eco-Functional Polymer Materials,Ministry of Education,College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,China;GDMPA Key Laboratory for Process Control and Quality Evaluation of Chiral Pharmaceuticals,Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine,School of Chemistry,South China Normal University,Guangzhou 510006,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2024年第4期651-661,共11页
Chinese Journal of Luminescence
基金
国家自然科学基金(22122402,22227804)
广东省自然科学基金(2023A1515010623,2021B1515020048,2023A1515010053,2021A1515010510)
广州市市校企联合资助项目(202201020154)
甘肃省高等学校产业支撑计划(2021CYZC-17)。
关键词
发光电化学池
TADF敏化荧光
BODIPYs
热活化延迟荧光
light-emitting electrochemical cells
TADF-sensitized fluorescence
BODIPY
thermally activated delayed fluorescence
