An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40 EQE

Wei Yang; Jingsheng Miao; Fengping HuYang ZouCheng ZhongShaolong GongChuluo Yang

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An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40 EQE

机译：An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40 EQE

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B/N-based multi-resonance thermally activated delayed fluorescence(MR-TADF) emitters and the corresponding narrow band emissive organiclight-emitting diodes (OLEDs) exhibit great potential for next-generation highresolutiondisplays. Nonetheless, designing MR-TADF emitters with emissionwavelength over 550 nm remains challenging. Herein, an effective approachtoward yellow-to-orange MR-TADF emitters by integrating a strong electrondonatingindolophenazine building block into the B/N-doped polycyclic aromatichydrocarbons is proposed. The investigation of photophysical propertiesreveals that the electron-donating difference between the donor segments ofMR framework has a dramatic influence on the luminescent features, includingthe emission wavelength and full-width at half-maximum (FWHM). TheseTADF emitters display excellent photophysical characteristics such as nearunityphotoluminescence quantum yields and almost 100% horizontal dipoleratio. As a result, yellow and orange OLEDs employing these emitters achievestate-of-the-art device performances with an ultrahigh external quantumefficiency of up to nearly 40%, power efficiency of 163 lm W~(?1), and luminanceclose to 120 000 cd m~(?2), which set a record among MR-TADF based OLEDswith emission peaks over 550 nm. More impressively, the fabricated devicepresents outstanding operational stability of LT99 over 110 h at the initialbrightness of 3000 cd m~(?2).

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来源
《Advanced functional materials》 |2023年第23期|2213056.1-2213056.8|共8页
作者
Wei Yang; Jingsheng Miao; Fengping HuYang ZouCheng ZhongShaolong GongChuluo Yang;
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作者单位

Shenzhen Key Laboratory of New Information Display and StorageMaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060, People’s Republic of China College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen;

Shenzhen Key Laboratory of New Information Display and StorageMaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060, People’s Republic of China;

Department of ChemistryHubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan 430072, People’s Republic of ChinaShenzhen Key Laboratory of New Information Display and StorageMaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060, People’s Republic of China Department of ChemistryHubei Key Lab on Organic and Polymeric Optoelectronic;

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indolophenazine; multi-resonance; organic light-emitting diodes; polycyclic aromatic hydrocarbons; thermally activated delayed fluorescence;

An Effective Approach toward Yellow-to-Orange Multi-Resonance TADF Emitters by Integrating Strong Electron Donor into B/N-Based Polycyclic Architecture: High Performance OLEDs with Nearly 40 EQE

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