Linearly Tunable Emission Colors Obtained from a Fluorescent–Phosphorescent Dual‐Emission Compound by Mechanical Stimuli

Abstract

Organic mechanoluminochromic materials are mechano/piezo-responsive and promising for applications in sensors, displays, and data storage devices. However, their switching range of emission is seriously impeded by only one kind of emission (either a fluorescent or phosphorescent peak) in the spectrum of single organic compounds. This study presents a design strategy for pure organic compounds with excellent room-temperature fluorescent-phosphorescent dual-emission (rFPDE) properties, which combines the effective factors of dipenylsulfone group, crystalline state, and heavy atom effect. Following the principle of color mixing, myriad emission colors with a wide range from orange to purple and across white zone in a straight line in the chromaticity diagram of the Commission Internationale de l'Eclairage (CIE) can be obtained by simply mechanical grinding the compound. The unique properties could be concentrated on a pure organic compound through this design strategy, which provides a new efficient channel for the discovery of efficient mechano-responsive organic materials.

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

“…For the white photoluminescence (PL) emitted from a single molecule, panchromatic or dual emissions are commonly used, which are assigned to both the blue emission in the HE region and a broad emission in the LE region. The blue emission is originated from the excited state of π–π* transition and/or singlet metal‐to‐ligand charge‐transfer ( 1 MLCT), while the low energetic emission could be generated from π···π interaction (dimer or excimer), partially excited energy‐transfer, intramolecular charge transfer (ICT, exciplex), metal‐to‐metal interaction (especially for the platinum(II) (Pt(II)) complexes), excited‐state proton transfer (ESPT), triplet excited states ( 3 MLCT and/or triplet ligand‐to‐ligand charge‐transfer ( 3 LLCT)). The complementary broad emission would occur in both solution and solid film.…”

Phosphorescence Through Hindered Motion of Pure Organic Emitters

“…A bridge between aggregation‐ and crystallisation‐induced phosphorescence and fluorescence was described by the group of Xu and co‐workers (Figure ). Here a system which responds to mechanical stimuli and is able to be switched from phosphorescence to fluorescence . To this end, two donor–acceptor diphenyl sulfones ( 43 ) and ( 44 ) were synthesised.…”

Carbon Dots with Dual‐Emissive, Robust, and Aggregation‐Induced Room‐Temperature Phosphorescence Characteristics

“…For instance, the carbon precursor used in this study (namely, trimellitic acid) shows such RTP properties (Supporting Information, Figure S19). Therefore, the achievement of grinding‐tolerant (or amorphous) metal‐free RTP materials is very challenging, but highly desirable . Interestingly, the TA‐CDs that were prepared in this study display nearly constant RTP intensity under continuously grinding (Figure a).…”