首页|TADF敏化荧光策略构建高效、窄光谱发光电化学池器件

TADF敏化荧光策略构建高效、窄光谱发光电化学池器件

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  • 国家科技期刊平台
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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2 285 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.
Achieving High-efficiency,High-color-purity Light-emitting Electrochemical Cells through TADF-sensitized Fluorescence Strategy
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 materi-als.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 diffi-cult 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 fabri-cated by selecting a suitable p-/n-doped host matrix,a nonionic TADF sensitizer,a fluorescent dye with high absorp-tion 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 2 285 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 con-structing TSF-LECs both from material and device points of view.

light-emitting electrochemical cellsTADF-sensitized fluorescenceBODIPYthermally activated de-layed fluorescence

陈荔丝、蓝燕婷、赵小龙、秦冬冬、张玉微、陶春兰、张保华、牛利

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广州大学化学化工学院 分析科学技术研究中心,广州市传感材料与器件重点实验室,广东省光电传感材料与器件工程技术研究中心,广东 广州 510006

西北师范大学 化学化工学院,生态功能高分子材料教育部重点实验室,甘肃 兰州 730070

华南师范大学 化学学院,手性药物制药过程控制与质量评价广东省药监局重点实验室,广州市生物医药分析化学重点实验室,广东 广州 510006

发光电化学池 TADF敏化荧光 BODIPYs 热活化延迟荧光

国家自然科学基金国家自然科学基金广东省自然科学基金广东省自然科学基金广东省自然科学基金广东省自然科学基金广州市市校企联合资助项目甘肃省高等学校产业支撑计划

22122402222278042023A15150106232021B15150200482023A15150100532021A15150105102022010201542021CYZC-17

2024

10.37188/CJL.20240012

发光学报
中国物理学会发光分会,中国科学院长春光学精密机械与物理研究所

发光学报

CSTPCD北大核心
影响因子：1.301
ISSN：1000-7032
年,卷(期)：2024.45(4)
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