Toward highly efficient deep-blue OLEDs: Tailoring the multiresonance-induced TADF molecules for suppressed excimer formation and near-unity horizontal dipole ratio

被引：36

作者：

Kim, Hyung Suk ^{[1
]}

Cheon, Hyung Jin ^{[2
,3
]}

Lee, Donggyun ^{[1
]}

Lee, Woochan ^{[1
]}

Kim, Junho ^{[1
]}

Kim, Yun-Hi ^{[2
,3
]}

Yoo, Seunghyup ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol KAIST, Sch Elect Engn, Daejeon 34141, South Korea

[2] Gyeongsang Natl Univ, Dept Chem, Jinju 52828, South Korea

[3] Gyeongsang Natl Univ, RIGET, Jinju 52828, South Korea

来源：

SCIENCE ADVANCES | 2023年 / 9卷 / 22期

基金：

新加坡国家研究基金会;

关键词：

ACTIVATED DELAYED FLUORESCENCE; LIGHT-EMITTING-DIODES; FRANCK-CONDON FACTORS; ORGANIC EMITTERS; BASIS-SETS; TRIPLET; SINGLET; ELECTROLUMINESCENCE; CONVERSION; ACCURACY;

D O I：

10.1126/sciadv.adf1388

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Boron-based compounds exhibiting a multiresonance thermally activated delayed fluorescence are regarded promising as a narrowband blue emitter desired for efficient displays with wide color gamut. However, their planar nature makes them prone to concentration-induced excimer formation that broadens the emission spec-trum, making it hard to increase the emitter concentration without raising CIE y coordinate. To overcome this bottleneck, we here propose o-Tol-nu-DABNA-Me, wherein sterically hindered peripheral phenyl groups are in-troduced to reduce intermolecular interactions, leading to excimer formation and thus making the pure narrow -band emission character far less sensitive to concentration. With this approach, we demonstrate deep-blue OLEDs with y of 0.12 and full width at half maximum of 18 nm, with maximum external quantum efficiency (EQE) of ca. 33%. Adopting a hyperfluorescent architecture, the OLED performance is further enhanced to EQE of 35.4%, with mitigated efficiency roll-off, illustrating the immense potential of the proposed method for energy-efficient deep-blue OLEDs.

引用

页数：10