Photo‐Modulating Multicolor Photoluminescence Including White‐Light Emission from a Photochromic Copolymer

Abstract

Organic photochromic materials have always been a hot topic among scientists, ascribed to its broad applications and characteristic properties of photo‐modulating multicolor photoluminescence. Meanwhile, white‐light emission of organic materials has drawn considerable attention in recent years. Herein, these two concepts are combined together to make an achievement in a photochromic copolymer with white‐light emission. A novel amorphous polyacrylamide copolymer consisting of tetraphenylethylene (TPE) and spiropyran (SP) monomers is synthesized, which is capable of emitting fluorescence with tunable colors including white‐light one with Commission Internationale de L’éclairage coordinates (0.33, 0.33). This new concept provides an available approach to obtain white‐light emission materials which will exert far‐reaching influence in its further development.

Molecular Engineering Approaches Towards All‐Organic White Light Emitting Materials

“…Ma and co‐workers recently reported a photochromic terpolymer (TPE‐SP‐PAM) through the copolymerization of the monomers tetraphenylethylene (TPE) and spiropyran (SP) in a relatively low proportion with acrylamide (Figure a) . The SP unit of the polymer was found to be converted from the closed to the open‐loop structure upon UV light irradiation.…”

“…Hence, a reversible tunable emission from bluish‐green to white to orange‐red and vice versa was obtained by varying the exposure time of the UV and visible light, respectively. Interestingly, the reversible tunable emission of the TPE‐SP‐PAM copolymer was found to be retained in the form of transparent resin, as well as amorphous powder, which can be promising for light emitting applications (Figure ) …”

“…(f) CIE chromaticity diagram of the aqueous polymer solution with increasing irradiation time ( λ ex =365 nm, [TPE‐SP‐PAM]=5 mg mL −1 ). Parts (b)–(e) were adapted from reference with copyright permission from John Wiley and Sons.…”

Multiple Photoluminescent Processes from Pyrene Derivatives with Aggregation‐ and Mechano‐Induced Excimer Emission

“…Moreover, solid-state luminescence can be tuned by external physical stimuli,s uch as grinding, pressing, heating, solventf umingo r the irradiation of light. [2,3] These methods generally change the way of molecules packing without changing the molecular structure. [4] Indeed, the materials with mechanochromismh ave attractedi ncreasing attention for their extensive applications in optoelectronic devices and chemical detectors.…”

A novel AIE-active dye for fluorescent nanoparticles by one-pot combination of Hantzsch reaction and RAFT polymerization: synthesis, molecular structure and application in cell imaging

“…13 Since then, more and more researchers have focused on the development of novel AIE-active molecules, and some typical AIEactive dyes have been developed such as tetraphenylethene (TPE), hexaphenylsilole (HPS) and distyreneanthracene (DSA) derivatives. [14][15][16][17][18][19][20] However, AIE-active molecules have inherent hydrophobicity due to their structure and are difficult to be directly applied in uorescence imaging. Therefore, in order to solve this problem, AIE-active molecules are usually converted into amphiphilic AIE-active uorescent nanoparticles.…”