Interlocked Rotaxane Enables TADF with Distinct Excited-State Structural Relaxation.

ABSTRACT: We present the first demonstration of a rotaxane-based thermally activated delayed fluorescence (TADF) exciplex, its unique excited-state structural relaxation and application in organic light-emitting diodes (OLEDs). The design employs a triazene cage (Trz-cage) as the host electron acceptor, threaded by a carbazole derivative with ethylene glycol ether chains serving as the guest donor, and capped at both ends with bulky triphenylmethane stoppers, thus forming the rotaxane exciplex, namely the charge-transfer CT-Rotaxane. The TADF nature of CT-Rotaxane is evidenced by microsecond-scale delayed fluorescence subject quenched by oxygen, a small singlet-triplet energy gap (ΔE_ST = 0.084 eV), and a fast reverse intersystem crossing rate of 9.8 × 10^5<

SUBMITTER: Lin CJ 

PROVIDER: S-EPMC12903867 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature