Sky-blue thermally activated delayed fluorescence (TADF) based on Ag(i) complexes: Strong solvation-induced emission enhancement

Alexander V. Artem'ev, Marsel Z. Shafikov, Alexander Schinabeck, Olga V. Antonova, Alexey S. Berezin, Irina Yu Bagryanskaya, Pavel E. Plusnin, Hartmut Yersin

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A new Ag(i) complex based on tris(2-pyridyl)phosphine (Py3P), [Ag2(Py3P)3(SCN)2], has been synthesized and chemically characterized. Theoretical calculations and photophysical investigations reveal thermally activated delayed fluorescence (TADF) coupled with outstanding solvato- A nd vapor-luminescent behavior. The parent complex [Ag2(Py3P)3(SCN)2] shows sky-blue TADF (λmax = 469 nm) at ambient temperature with a quantum yield of ΦPL = 16% and an emission decay time of 2.2 μs. Upon exposing the complex to CH2Cl2 or CHCl3 vapors, [Ag2(Py3P)3(SCN)2]·0.66CH2Cl2 and [Ag2(Py3P)3(SCN)2]·CHCl3 solvates are formed. This process is accompanied by a strong enhancement of the luminescence intensity. Both solvates also emit sky-blue TADF (λmax = 478-483 nm), but the emission quantum yield reaches ΦPL ≈ 70% at an emission decay time of 9-12 μs, depending on the solvent. According to DFT/TD-DFT computations, the observed TADF originates from a 1(M + X)LCT excited state. The experimentally determined ΔE(S1-T1) gap for [Ag2(Py3P)3(SCN)2]·0.66CH2Cl2 is relatively large and amounts to 1040 cm-1 (≈129 meV).

Original languageEnglish
Pages (from-to)3168-3176
Number of pages9
JournalInorganic Chemistry Frontiers
Volume6
Issue number11
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • LIGHT-EMITTING-DIODES
  • CU(I) COMPLEXES
  • PHOTOLUMINESCENCE PROPERTIES
  • COORDINATION POLYMERS
  • SILVER(I) COMPLEXES
  • TRIPLET EMITTERS
  • DESIGN STRATEGY
  • BASIS-SETS
  • CU-I
  • LUMINESCENCE

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