Coordination-Induced Thermally Activated Delayed Fluorescence: From Non-TADF Donor-Acceptor-Type Ligand to TADF-Active Ag-Based Complexes - Details

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Abstract：

Herein,　we　present　a　new　strategy　in　which　highly　emissive　thermally　activated　delayed　fluorescence　(TADF)　materials　can　be　obtained　from　modifying　or　tuning　a　non-TADF　donor　(D)-acceptor　(A)-type　organic　molecule　via　coordination　of　the　metal　ionic　fragment.　Theoretical　calculation　and　photophysical　properties　reveal　that　the　D-A-type　free　ligand　emits　both　weak　fluorescence　and　dual　roomerature　phosphorescence,　whereas　the　two　Ag(I)　complexes　display　efficient　blue　TADF,　exhibiting　photoluminescence　quantum　yields　nearly　100%　in　films　with　short　decay　lifetimes　(τ　≈　6　μs).　This　is　attributed　to　the　four　optimized　parameters　induced　by　Ag(I)　coordination:　(1)　narrow　singlet　(S1)-triplet　(T1)　energy　gaps　(Î＂EST).　(2)　T1　states　have　a　hybrid　local　excitation　and　charge　transfer　(CT)　character,　and　S1　states　have　a　predominant　CT　character.　Both　the　parameters　facilitate　reverse　intersystem　crossing.　(3)　Radiative　rate　constant　(kr(S1→S0))　is　increased.　(4)　Molecular　rigidity　is　strengthened.　For　the　first　time,　this　work　shows　a　powerful　method　to　design　efficient　ligand-centered　TADF　in　Ag(I)　complexes　based　on　the　conventional　D-A-type　molecule,　which　significantly　enriches　the　chemical　space　for　the　development　of　TADF　materials.　©　2019　American　Chemical　Society.

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[ 1 ] [Jia, J.-H.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 2 ] [Jia, J.-H.]University of Chinese Academy of Sciences, Beijing, 100049, China
[ 3 ] [Liang, D.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 4 ] [Liang, D.]College of Chemistry, Fuzhou University, Fuzhou, 350116, China
[ 5 ] [Yu, R.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 6 ] [Chen, X.-L.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 7 ] [Chen, X.-L.]Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 8 ] [Meng, L.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 9 ] [Meng, L.]Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China
[ 10 ] [Chang, J.-F.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 11 ] [Chang, J.-F.]University of Chinese Academy of Sciences, Beijing, 100049, China
[ 12 ] [Liao, J.-Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 13 ] [Yang, M.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 14 ] [Yang, M.]University of Chinese Academy of Sciences, Beijing, 100049, China
[ 15 ] [Li, X.-N.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 16 ] [Lu, C.-Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian, 350002, China
[ 17 ] [Lu, C.-Z.]Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, China

Reprint 's Address：

[Lu, C.-Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of SciencesChina

Email：

czlu@fjirsm.ac.cn

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Chemistry of Materials

ISSN： 0897-4756

Year： 2020

Issue： 1

Volume： 32

Page： 620-629

9 . 8 1 1

JCR@2020

7 . 2 0 0

JCR@2023

ESI HC Threshold：196

JCR Journal Grade：1

CAS Journal Grade：2

Cited Count：

WoS CC Cited Count：

SCOPUS Cited Count： 48

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 0

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