Mixture analysis using solid substrate room temperature luminescence

Amorphous Metal-Free Room-Temperature Phosphorescent Small Molecules with Multicolor Photoluminescence via a Host–Guest and Dual-Emission Strategy

“…Therefore, the promotion of intersystem crossing (ISC) efficiency and the suppression of the nonradiative relaxation process predominate in the construction of pure organic RTP materials . On the basis of the aforementioned principles, several methods have already been developed including the embedding of organic phosphors into solid substrate, silica glass, polymer matrix, − and the cavity of macrocycle hosts. − RTP emission could also be enhanced by embedding the phosphor into poly­(vinyl alcohol) (PVA) or poly­(methyl methacrylate) (PMMA) to suppress the vibrational dissipation. Amorphous rigid steroidal compounds have also been applied to minimize the quenching of long-lived triplet excited states and to achieve efficient phosphorescence in pure organic amorphous guest materials in air. − Recently, a unique pure organic amorphous RTP system was developed by a simple radical polymerization of acrylamide and organic phosphors without extra processing, which could generate efficient RTP emission .…”

“…Therefore, the promotion of intersystem crossing (ISC) efficiency and the suppression of the nonradiative relaxation process predominate in the construction of pure organic RTP materials. 11 On the basis of the aforementioned principles, several methods have already been developed including the embedding of organic phosphors into solid substrate, 12 silica glass, 13 polymer matrix, 14−16 and the cavity of macrocycle hosts. 17−20 RTP emission could also be enhanced by embedding the phosphor into poly(vinyl alcohol) (PVA) 21 or poly(methyl methacrylate) (PMMA) 22 to suppress the vibrational dissipation.…”

Crystallization-induced dual emission from metal- and heavy atom-free aromatic acids and esters

“…Triplet states in organic luminogens are thus typically dark states. Although previous examples of solid substrate-RTP (SS-RTP), 9 micelle stabilized-RTP (MS-RTP) 10 and cyclodextrin-induced RTP (CD-RTP) 11 have been reported, normally special and complex fabrication techniques are required and only instrument detectable signals are obtained.…”

Room temperature phosphorescence from natural products: Crystallization matters

“…However, it is difficult to obtain efficient room temperature phosphorescence (RTP) from pure organic molecules due to the spin-forbidden of triplet exciton transition, thermal deactivation and chemical quenching during the long lifetime of triplets. Although solid substrate RTP (SSRTP) [9], micelle stabilized RTP (MS RTP) [10], cyclodextrin-induced RTP (CD-RTP) [11] have been reported, their efficiencies are rather low, most of which are only at detectable levels.…”