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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
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High-performance blue OLED using multiresonance thermally activated delayed fluorescence host materials containing
Dongmin Park1, Seokwoo Kang2, Chi Hyun Ryoo1
1Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Nature Communications
|September 11, 2023
Summary
New blue-emitter host materials featuring 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene and tetraphenylsilyl groups achieve high efficiency and low roll-off in organic light-emitting diodes.
Area of Science:
- Organic electronics
- Materials science
- Photophysics
Background:
- Thermally activated delayed fluorescence (TADF) materials are crucial for efficient organic light-emitting diodes (OLEDs).
- Developing stable and efficient blue emitters remains a significant challenge in OLED technology.
- Boron-containing heterocyclic compounds offer unique electronic properties for optoelectronic applications.
Purpose of the Study:
- To design and synthesize novel multiresonance TADF host materials for blue emitters.
- To investigate the photophysical properties and device performance of these new host materials.
- To understand the structure-property relationships governing high efficiency and stability in OLEDs.
Main Methods:
- Synthesis of three novel host materials incorporating 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA) and tetraphenylsilyl groups.
- Fabrication of OLED devices using these host materials doped with a conventional blue emitter (ν-DABNA).
- Characterization of photoluminescence quantum yield, horizontal orientation, photoluminescence decay time, and external quantum efficiency.
Main Results:
- The synthesized host materials exhibit high photoluminescence quantum yields (>0.82) and high horizontal orientation (>88%).
- Devices fabricated with (4-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)phenyl)triphenylsilane (TDBA-Si) achieved high external quantum efficiencies (up to 36.2%).
- The TDBA-Si host material demonstrated excellent performance with >30% efficiency and minimal roll-off (4.9% at 1,000 cd m⁻²).
Conclusions:
- The developed multiresonance TADF host materials, particularly TDBA-Si, are highly effective for efficient and stable blue OLEDs.
- Fast energy transfer from host to dopant, T1 excited-state contribution, and aggregation inhibition contribute to the superior device performance.
- These findings pave the way for advanced blue emitter systems in next-generation display and lighting technologies.
