Abstract
The molecular photophysics of 10-phenyl-10H,10′H-spiro[acridine-9,9′-anthracen]-10′-one (ACRSA) are used as an ideal molecule to probe how external factors affect the TADF and rISC mechanisms.
Highlights
We recently revealed the complex solution state molecular photophysics[1] of the deceptively simple thermally activated delayed fluorescence (TADF) molecule 10-phenyl-10H,100H-spiro[acridine9,90-anthracen]-100-one (ACRSA), see Scheme S1 (ESI†).[2,3,4] This is an important TADF molecule for two reasons
As we have previously shown, the degree of charge separation and the amount of local wavefunction character dictates the photophysical character of the excited state in such D–A molecules,[36,37] we propose that this blue emission band is a mixed 1np* 1pp* CT excited state having a high degree of charge transfer character
Irrespective of host, or ACRSA loading that the DF decays monoexponentially and no long time, nonexponential decay time tail is observed in the decay kinetics, which is usually observed in D–A TADF molecules with a C–N bridge between D and A, Fig. 5
Summary
We recently revealed the complex solution state molecular photophysics[1] of the deceptively simple thermally activated delayed fluorescence (TADF) molecule 10-phenyl-10H,100H-spiro[acridine9,90-anthracen]-100-one (ACRSA), see Scheme S1 (ESI†).[2,3,4] This is an important TADF molecule for two reasons. The acridine donor (D) and anthracenone acceptor (A) units of the ACRSA molecule are bridged by a spiro carbon, not the usual C–N bond found in most D–A TADF molecules. This connecting group, imparts the required orthogonality between the D and A,5 but is considered to be significantly stronger than bridging C–N bonds. This is one of the suspected main causes of the short operational lifetimes achievable by TADF emitters in devices.
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