Donor‐Void‐Acceptor Type TADF Emitters with Asymmetric Donors for Highly Efficient Deep Blue OLEDs DOI Open Access
Yongqiang Mei, Jiuyan Li, Di Liu

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Abstract Two asymmetric donor‐acceptor‐donor’ (D‐A‐D’) type deep blue thermally activated delayed fluorescence (TADF) emitters, namely PAO‐1 and PAO‐2, are developed with highly rigid 10‐(pyridin‐2‐yl)acridin‐9(10 H )‐one (PAO) as acceptor (A). PAO is characterized by the 3,6‐sites carbon atoms that void to its own HOMO deeper HOMO‐2 of rather than involved in TADF emitters. Such D‐void‐A connecting mode favors lower molecular generate short‐wavelength enlarging bandgap different carbazole donors utilized D‐A‐D’ which not only keep emission but also enhance oscillator strength ( f ) for faster radiative transition rates k r s > 10 8 −1 slightly slow intersystem crossing (ISC) ISC s) reverse RISC symmetric PAO‐0, can reduce exciton trap conversion cycles between singlet triplet excitons. The OLEDs PAO‐2 exhibit external quantum efficiencies (EQEs) 32.5% 30.1% CIE (0.15, 0.10) 0.11) low‐efficiency roll‐offs. These findings provide a design strategy developing efficient deep‐blue

Language: Английский

Boosting Electroluminescence Efficiency based on TADF Emitters Featuring Multiple Resonance Segment Integrated with a Co-host Exciplex DOI

Zhaoyun Jin,

Chengcheng Wu,

Kai‐Ning Tong

et al.

Materials Today Energy, Journal Year: 2025, Volume and Issue: unknown, P. 101833 - 101833

Published: Feb. 1, 2025

Language: Английский

Citations

0
Rational Design of High-Efficiency Deep-Blue Multi-Resonance Thermally Activated Delayed Fluorescence Materials with CIEy < 0.06 and Narrowband Emission DOI
Junyi Wang,

Z. N. Xia,

Xu‐Feng Luo

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Language: Английский

Citations

0
Donor‐Void‐Acceptor Type TADF Emitters with Asymmetric Donors for Highly Efficient Deep Blue OLEDs DOI Open Access
Yongqiang Mei, Jiuyan Li, Di Liu

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Abstract Two asymmetric donor‐acceptor‐donor’ (D‐A‐D’) type deep blue thermally activated delayed fluorescence (TADF) emitters, namely PAO‐1 and PAO‐2, are developed with highly rigid 10‐(pyridin‐2‐yl)acridin‐9(10 H )‐one (PAO) as acceptor (A). PAO is characterized by the 3,6‐sites carbon atoms that void to its own HOMO deeper HOMO‐2 of rather than involved in TADF emitters. Such D‐void‐A connecting mode favors lower molecular generate short‐wavelength enlarging bandgap different carbazole donors utilized D‐A‐D’ which not only keep emission but also enhance oscillator strength ( f ) for faster radiative transition rates k r s > 10 8 −1 slightly slow intersystem crossing (ISC) ISC s) reverse RISC symmetric PAO‐0, can reduce exciton trap conversion cycles between singlet triplet excitons. The OLEDs PAO‐2 exhibit external quantum efficiencies (EQEs) 32.5% 30.1% CIE (0.15, 0.10) 0.11) low‐efficiency roll‐offs. These findings provide a design strategy developing efficient deep‐blue

Language: Английский

Citations

0