Unveiling the crucial contributions of electrostatic and dispersion interactions to the ultralong room-temperature phosphorescence of H-bond crosslinked poly(vinyl alcohol) films

Abstract

Organic phosphors exhibiting room-temperature phosphorescence (RTP) in the amorphous phase are promising candidates for optoelectronic and biomedical applications. In particular, noncovalently embedding organic phosphors into poly(vinyl alcohol) (PVA) matrix has...

Boosting Circularly Polarized Luminescence from Alkyl-Locked Axial Chirality Scaffold by Restriction of Molecular Motions

“…Therefore, treated PVA networks provide sufficient intermolecular interactions, including strong hydrogen bonding, electrostatic, and dispersion interactions. [69] Particularly, the soft polymer chains and repeating hydroxyl groups can closely surround the molecularly dispersed dyes, giving superior restriction of molecular motions than crystal packing. Here, Fourier transform infrared spectroscopy was utilized to analyse existing molecular interactions (Figure S6) [70] .…”

Noncovalent Bridged Bis(Coumarin‐24‐Crown‐8) Phosphorescent Supramolecular Switch

“…To obtain RTP, we coassembly C24C8 with PVA which was an effective method to obtain amorphous RTP materials. [ 17 ] Firstly, the photophysical properties of C24C8 @PVA were studied through photoluminescence spectra and delayed spectra (delayed 1 ms) at different temperatures. As shown in Figure S5 (Supporting Information), both the intensity of photoluminescence and delayed spectra of C24C8 @PVA increased with the decline of temperature, which indicated the phosphorescence nature of the emission at 516 nm.…”

The effect of substituents and molecular aggregation on the room temperature phosphorescence of a twisted π-system

“…7 Thus, several groups have investigated molecular designs and the control of intermolecular interactions to promote ISC and suppress non-radiative decay to obtain organic RTP materials with high quantum yield and long lifetime. 15 The most common strategies are based on the incorporation of heteroatoms with lone pairs, such as O and N. 16 Approaches involving molecular aggregation, 17,18 co-crystallization, 19,20 polymeric systems, 21 host-guest doping systems, 22,23 energy-gap narrowing, 24,25 twisted p systems, 16,26 and structures without lone pairs 27 have also been explored. The inclusion of functional groups has proved to be an important tool for taking full advantage of the El-Sayed rule, promoting an efficient ISC between states with different orbital configurations, populating the triplet states, and adjusting the RTP.…”