Single‐Component‐Based White Light Photoluminescence Emission via Selective Photooxidation in an Organic–Polymer Hybrid System

Abstract

White light-emitting phenothiazine-poly(dimethylsiloxane) (PTZ-PDMS) composites are formed by a photooxidation reaction. The oxidized PTZ species, i.e., PTZ cation radicals and dication species, are created by electron transfer from the PTZ molecules to PDMS under UV irradiation. In situ UVvis and electron spin resonance (ESR) spectroscopies are carried out after UV exposure of PTZ-PDMS, and the results provide evidence for the spontaneous ionization of PTZ. The spectral changes indicate the formation of PTZ •+ (radical cation) and PTZ 2+ (dication) within the PDMS matrix. Moreover, a combination of PTZ, PTZ •+ , and PTZ 2+ , together with the PDMS matrix, show an unexpected emission of white light with Commission Internationale de L'Eclairage coordinates of 0.34 and 0.32, which are close to those of pure white light. These findings potentially offer a new route and strategy for the development of flexible white light-emitting materials.

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

“…Copyright 2017, American Chemical Society of Chemistry. b,d,e) Reproduced with permission . Copyright 2017 and 2018, John Wiley and Sons.…”

“…The newly generated species contribute to the additional emission peaks from 550 to 800 nm. With the HE emission from 111 , a white‐light emission will be observed after the photo‐oxidation of PTZ‐PDMS (Figure d,e) …”

“…With the HE emission from 111, a white-light emission will be observed after the photo-oxidation of PTZ-PDMS (Figure 35d,e). [154]…”

Sensitive and Repeatable Photoinduced Luminescent Radicals from A Simple Organic Crystal

“…Choi et al. recently reported the white luminescence of phenothiazine‐poly(dimethylsiloxane) hybrid system, which came from the integrated emissions of the molecules, radicals and cations of phenothiazine under air atmosphere [9] . But the radical species were generated slowly over hours by continuously irradiated with an UV lamp under air.…”

Synthesis and Photophysical Properties of Light‐Harvesting Gold Nanoclusters Fully Functionalized with Antenna Chromophores

“…Several chemical systems based on small molecules, polymers, and quantum dots have been developed for achieving multicolor emission. [ 71,72 ] The present work demonstrates that it is possible to tailor the optical properties of gold clusters via the attachment of photoresponsive organic chromophores. Gold clusters possessing well‐defined atomic and electronic structures offer a powerful platform for the find control of the excited‐state relaxation processes, such as energy migration between chromophores and energy/electron transfer processes between the chromophore and the cluster, and hold promise for applications in the fields of photovoltaics, optical sensing, nonlinear optics, and light emitting displays.…”