期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105805
关键词
deep blue; heteroatoms; hyperfluorescence; OLEDs; TADF
类别
资金
- National Research Foundation of Korea [NRF-2019M3D1A2104019]
- National Research Foundation of Korea [5120200113702] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
By designing and synthesizing two new deep blue TADF materials, deep blue emission and high efficiency have been achieved in OLED devices. The deep blue TADF emitters exhibit outstanding external quantum efficiency and high photoluminescence quantum yields.
Simultaneously obtaining high efficiency and deep blue emission in organic light emitting diodes (OLEDs) remains a challenge. To overcome the demands associated with deep blue thermally activated delayed fluorescence (TADF) emitters, two deep blue TADF materials namely, DBA-BFICz and DBA-BTICz, are designed and synthesized by incorporating oxygen-bridged boron (DBA) acceptor with heteroatoms, oxygen and sulphur-based donors, BFICz and BTICz, respectively. Both TADF materials show deep blue photoluminescence emissions below 450 nm by enhancing the optical band gap over 2.8 eV through deeper highest occupied molecular orbital (HOMO) level of heteroatom based donor moieties. At the same time, the photoluminescence quantum yields (PLQYs) of both TADF materials remain over 94%. The TADF device with DBA-BFICz as an emitter exhibits a good external quantum efficiency (EQE) of 33.2%. Since both new TADF materials show deep blue emissions and high efficiencies, hyperfluorescence (HF) OLED devices are fabricated using nu-DABNA as a fluorescence dopant. DBA-BFICz as a TADF sensitized host in HF-OLED reveals an outstanding EQE of 38.8% along with narrow full width at half maximum of 19 nm in the bottom emission pure blue OLEDs. This study provides an approach to develop deep blue TADF emitters for highly efficient OLEDs.
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