Thermally Activated Delayed Fluorescence with Nanosecond Emission Lifetimes and Minor Concentration Quenching: Achieving High-Performance Nondoped and Doped Blue OLEDs - Details

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Abstract：

Simultaneously　achieving　a　high　photoluminescence　quantum　yield　(PLQY),　ultrashort　exciton　lifetime,　and　suppressed　concentration　quenching　in　thermally　activated　delayed　fluorescence　(TADF)　materials　is　desirable　yet　challenging.　Here,　a　novel　acceptor-donor-acceptor　type　TADF　emitter,　namely,　2BO-sQA,　wherein　two　oxygen-bridged　triarylboron　(BO)　acceptors　are　arranged　with　cofacial　alignment　and　positioned　nearly　orthogonal　to　the　rigid　dispirofluorene-quinolinoacridine　(sQA)　donor　is　reported.　This　molecular　design　enables　the　compound　to　achieve　highly　efficient　(PLQYs　up　to　99%)　and　short-lived　(nanosecond-scale)　blue　TADF　with　effectively　suppressed　concentration　quenching　in　films.　Consequently,　the　doped　organic　light-emitting　diodes　(OLEDs)　base　on　2BO-sQA　achieve　exceptional　electroluminescence　performance　across　a　broad　range　of　doping　concentrations,　maintaining　maximum　external　quantum　efficiencies　(EQEs)　at　over　30%　for　doping　concentrations　ranging　from　10　to　70　wt%.　Remarkably,　the　nondoped　blue　OLED　achieves　a　record-high　maximum　EQE　of　26.6%　with　a　small　efficiency　roll-off　of　14.0%　at　1000　candelas　per　square　meter.　By　using　2BO-sQA　as　the　sensitizer　for　the　multiresonance　TADF　emitter　nu-DABNA,　TADF-sensitized　fluorescence　OLEDs　achieve　high-efficiency　deep-blue　emission.　These　results　demonstrate　the　feasibility　of　this　molecular　design　in　developing　TADF　emitters　with　high　efficiency,　ultrashort　exciton　lifetime,　and　minimal　concentration　quenching.　A　novel　acceptor-donor-acceptor　type　molecular　skeleton　is　designed　to　realize　blue　thermally　activated　delayed　fluorescence　with　ultrahigh　emission　efficiencies　(up　to　99%),　nanosecond　exciton　lifetimes,　and　effectively　suppressed　concentration　quenching　in　films.　The　doped　and　nondoped　organic　light-emitting　diodes　attain　high　external　quantum　efficiencies　up　to　32.0%　and　26.6%,　respectively.　image

Keyword：

blue emission concentration quenching emission lifetime organic light-emitting diodes thermally activated delayed fluorescence

Community：

[ 1 ] [Wu, Shao-Jie]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 2 ] [Fu, Xi-Feng]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 3 ] [Zhang, Dong-Hai]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 4 ] [Sun, Yu-Fu]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 5 ] [Lu, Xin]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 6 ] [Lin, Fu-Lin]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 7 ] [Meng, Lingyi]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 8 ] [Chen, Xu-Lin]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 9 ] [Lu, Can-Zhong]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[ 10 ] [Wu, Shao-Jie]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 11 ] [Fu, Xi-Feng]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 12 ] [Zhang, Dong-Hai]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 13 ] [Sun, Yu-Fu]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 14 ] [Lu, Xin]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 15 ] [Lin, Fu-Lin]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 16 ] [Meng, Lingyi]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 17 ] [Chen, Xu-Lin]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 18 ] [Lu, Can-Zhong]Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China
[ 19 ] [Wu, Shao-Jie]Fuzhou Univ, Coll Chem, Fuzhou 350108, Fujian, Peoples R China
[ 20 ] [Fu, Xi-Feng]Fuzhou Univ, Coll Chem, Fuzhou 350108, Fujian, Peoples R China
[ 21 ] [Chen, Xu-Lin]Fuzhou Univ, Coll Chem, Fuzhou 350108, Fujian, Peoples R China
[ 22 ] [Lu, Can-Zhong]Fuzhou Univ, Coll Chem, Fuzhou 350108, Fujian, Peoples R China
[ 23 ] [Chen, Xu-Lin]Fujian Sci & Technol Innovat Lab Optoelect Informa, Fuzhou 350108, Fujian, Peoples R China
[ 24 ] [Lu, Can-Zhong]Fujian Sci & Technol Innovat Lab Optoelect Informa, Fuzhou 350108, Fujian, Peoples R China

Reprint 's Address：

陈旭林卢灿忠
[Chen, Xu-Lin]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;;[Lu, Can-Zhong]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China

Email：

xlchem@fjirsm.ac.cn |
czlu@fjirsm.ac.cn

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