Deep-Blue Oxadiazole-Containing Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes

被引：67

作者：

Wong, Michael Y. ^{[1
]}

Krotkus, Simonas ^{[2
]}

Copley, Graeme ^{[1
]}

Li, Wenbo ^{[2
]}

Murawski, Caroline ^{[2
]}

Hall, David ^{[1
,2
]}

Hedley, Gordon J. ^{[2
]}

Jaricot, Marie ^{[1
]}

Cordes, David B. ^{[1
]}

Slawin, Alexandra M. Z. ^{[1
]}

Olivier, Yoann ^{[3
]}

Beljonne, David ^{[3
]}

Muccioli, Luca ^{[4
]}

Moral, Monica ^{[5
]}

Sancho-Garcia, Juan-Carlos ^{[6
]}

Gather, Malte C. ^{[2
]}

Samuel, Ifor D. W. ^{[2
]}

Zysman-Colman, Eli ^{[1
]}

机构：

[1] Univ St Andrews, EaStCHEM Sch Chem, Organ Semicond Ctr, St Andrews KY16 9ST, Fife, Scotland

[2] Univ St Andrews, Sch Phys & Astron, SUPA, Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland

[3] Univ Mons, Lab Chem Novel Mat, B-7000 Mons, Belgium

[4] Univ Bordeaux, UMR 5629, Lab Chim Polymeres Organ, F-33607 Pessac, France

[5] Univ Castilla La Mancha, Renewable Energy Res Inst, Paseo Invest 1, Albacete 02071, Spain

[6] Univ Alicante, Dept Phys Chem, E-03080 Alicante, Spain

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 39期

基金：

英国工程与自然科学研究理事会;

关键词：

thermally activated delayed fluorescence; organic light emitting diodes; oxadiazoles; blue emitters; DFT calculations; EXTERNAL QUANTUM EFFICIENCY; LOW-DRIVING-VOLTAGE; MOLECULAR DESIGN; PURE BLUE; METAL-COMPLEXES; ROLL-OFF; TRIPLET; DEVICES; EMISSION; OLEDS;

D O I：

10.1021/acsami.8b11136

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A series of four novel deep-blue to sky-blue thermally activated delayed fluorescence (TADF) emitters (2CzdOXDMe, 2CzdOXD4MeOPh, 2CzdOXDPh, and 2CzdOXD4CF(3)Ph) have been synthesized and characterized. These oxadiazole-based emitters demonstrated bluer emission compared with the reference emitter 2CzPN thanks to the weaker acceptor strength of the oxadiazole moieties. The oxadiazole compounds doped in hosts (mCP and PPT) emitted from 435 to 474 nm with photoluminescence quantum yields ranging from 14-55%. The emitters possess singlet triplet excited-state energy gaps (Delta E-ST) between 0.25 and 0.46 eV resulting in delayed components ranging from 4.8 to 25.8 ms. The OLED device with 2CzdOXD4CF(3)Ph shows a maximum external quantum efficiency of 11.2% with a sky-blue emission at CIE of (0.17, 0.25), while the device with 2CzdOXD4MeOPh shows a maximum external quantum efficiency of 6.6% with a deep-blue emission at CIE of (0.15, 0.11).

引用

页码：33360 / 33372

页数：13

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