Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Inorganic chemistry frontiers, 2019-11, Vol.6 (11), p.3168-3176

Ort / Verlag

London: Royal Society of Chemistry

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A new Ag( i ) complex based on tris(2-pyridyl)phosphine (Py 3 P), [Ag 2 (Py 3 P) 3 (SCN) 2 ], has been synthesized and chemically characterized. Theoretical calculations and photophysical investigations reveal thermally activated delayed fluorescence (TADF) coupled with outstanding solvato- and vapor-luminescent behavior. The parent complex [Ag 2 (Py 3 P) 3 (SCN) 2 ] shows sky-blue TADF ( λ max = 469 nm) at ambient temperature with a quantum yield of Φ PL = 16% and an emission decay time of 2.2 μs. Upon exposing the complex to CH 2 Cl 2 or CHCl 3 vapors, [Ag 2 (Py 3 P) 3 (SCN) 2 ]·0.66CH 2 Cl 2 and [Ag 2 (Py 3 P) 3 (SCN) 2 ]·CHCl 3 solvates are formed. This process is accompanied by a strong enhancement of the luminescence intensity. Both solvates also emit sky-blue TADF ( λ max = 478-483 nm), but the emission quantum yield reaches Φ PL 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 Δ E (S 1 − T 1 ) gap for [Ag 2 (Py 3 P) 3 (SCN) 2 ]·0.66CH 2 Cl 2 is relatively large and amounts to 1040 cm −1 ( 129 meV). Remarkable solvation-induced emission enhancement is discovered on a new Ag( i ) complex showing sky-blue thermally activated delayed fluorescence (TADF).