4.8 Article

Thermally Activated Delayed Fluorescence Warm White Organic Light Emitting Devices with External Quantum Efficiencies Over 30%

期刊

ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 31, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202101647

关键词

energy transfer; single emitting-layer; thermally activated delayed fluorescence; white organic light-emitting diodes

资金

  1. National Key Research AMP
  2. Development Program of China [2020YFA0714601]
  3. National Natural Science Foundation of China [51821002, 52003187, 52003185]
  4. Collaborative Innovation Center of Suzhou Nano Science Technology
  5. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  6. 111 Project
  7. Joint International Research Laboratory of Carbon-Based Functional Materials and Devices

向作者/读者索取更多资源

A high-performance all-TADF single-emitting-layer WOLEDs has been achieved by utilizing a simple system based on two color-complementary TADF emitters. The design optimizes energy transfer and triplet-to-singlet conversion to achieve full exciton utilization and color balance, leading to a maximum EQE of 32.8% which surpasses previous reports based on both TADF and phosphorescence.
While monochrome organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) emitters have achieved over 30% external quantum efficiencies (EQEs), all-TADF white OLEDs (WOLEDs) are still lagging behind. Herein, a simple system based on two color-complementary TADF emitters is exploited to realize high-performance WOLEDs. By doping a high-performance orange-red TADF fluorophor (BPPZ-DPXZ) into a blue TADF host (DBFCz-Trz), energy transfer, and triplet-to-singlet conversion in the host-dopant system can be optimized to simultaneously achieve full exciton utilization and color balance. With this design, all-TADF single-emitting-layer WOLEDs with a maximum EQE up to 32.8% are demonstrated. This high efficiency surpasses EQEs of reported WOLEDs based on both TADF as well as phosphorescence. It is expected that this finding can provide new insight for designing highly efficient all-TADF WOLEDs.

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