Room‐temperature phosphorescence materials from crystalline to amorphous state

Abstract

Room temperature phosphorescence (RTP) in metal‐free organic materials has attracted considerable attention due to its rich excited state properties, high quantum efficiency, long luminescence lifetimes, etc., showing great potential in organic optoelectronic devices, bioimaging, information anti‐counterfeiting, and so forth. The crystals have excellent rigidity and clear molecular packing patterns, which can effectively avoid non‐radiative transitions of excitons for phosphorescence enhancement. In the early stages, researchers paid great attention to the regulation of RTP performance in crystalline states. However, due to the complex preparation and poor processability of crystals, amorphous materials with RTP features have become a new research topic recently. This perspective aims to summarize the recent advances of RTP materials from crystalline to amorphous states, and analyze their molecular design strategies and luminescence mechanisms in detail. Finally, we prospect the future research directions of amorphous RTP materials. This perspective will provide a guideline for the future study of advanced RTP materials.

Time-dependent photo-activated aminoborane room-temperature phosphorescence materials with unprecedented properties: simple, versatile, multicolor-tuneable, water resistance, optical information writing/erasing, and multilevel data encryption

“…Since then, a variety of organic small molecule doped polymer RTP materials have been reported. 2,6 For example, commonly used polymer matrices include polymethyl methacrylate (PMMA), polylactic acid (PLA), polyacrylamide (PAM), polystyrene (PS) and so on. 7 Among them, PMMA organic RTP materials are more popular, because of their abundant carbonyl groups.…”

“…Since then, various organic small molecule-doped polymer RTP materials have been reported. 2,6 For example, commonly used polymer matrices include polymethyl methacrylate (PMMA), polylactic acid (PLA), polyacrylamide (PAM), and polystyrene (PS). 7 Among them, organic RTP materials based on PMMA are popular because of their abundant carbonyl groups, good transparency, chemical stability, mechanical properties, and low permeability by oxygen, and PMMA is called “plexiglass”.…”

Role of halogen effects and cyclic imide groups in constructing red and near-infrared room temperature phosphorescence molecules: theoretical perspective and molecular design

“…[1][2][3] In addition, phosphorescence emitted by these organic molecules with long lifetimes of triple excited states can eliminate the short lifetime interference from background fluorescence, and they can also be used as an ideal reagent for highly sensitive biological imaging. [4][5][6] Thus, the development of new efficient RTP molecules is highly desired especially for red and nearinfrared (NIR) RTP molecules. Inspired by this point, many efforts have been devoted to this area.…”

Colorful Triplet Excitons in Carbon Nanodots for Time Delay Lighting

“…[16][17][18] Generally, the triplet electrons are populated through the intersystem crossing (ISC) process of singlet electrons. [19] In short, electrons are pumpedup from the ground state to the singlet excited state after incident photons are absorbed by CNDs. The electrons spin flips under spinorbit coupling (SOC), and triplet excitons are formed by combining with the holes through coulomb inter action.…”