Metal‐Free Organic Luminophores that Exhibit Dual Fluorescence and Phosphorescence Emission at Room Temperature

Abstract

materials that exhibit dual fluorescence and phosphorescence emission in the solid state at room temperature to produce bimodal steady-state emission spectra. The dual emitters presented herein are categorized into the following six compound classes: (1) difluoroboron diaroylmethanes, (2) diarylketones, (3) diarylsulfones, (4) triazines and pyrimidines, (5) fused phenazines, and (6) N-arylcarbazoles.

Unprecedented and Readily Tunable Photoluminescence from Aliphatic Quaternary Ammonium Salts**

“…The impressive PL properties of TMAB and CTAB indicate that QASs can be competitive candidates for the generation of efficient (p‐)RTPs, which are currently being extensively studied in aromatics [34–45] . Considering the strong Coulombic interactions between halogen counterions (X − ) and positively charged quaternary N moieties (N + ), heavy halogen ions should play important roles in the formation of clustered chromophores.…”

“…Chemie studied in aromatics. [34][35][36][37][38][39][40][41][42][43][44][45] Considering the strong Coulombic interactions between halogen counterions (X À ) and positively charged quaternary N moieties (N + ), heavy halogen ions should play important roles in the formation of clustered chromophores. Moreover, they can considerably enhance the SOC and subsequent ISC processes due to the clustering effect [46] and the renowned heavy-atom effect.…”

Revealing Internal Heavy Chalcogen Atom Effect on the Photophysics of Dibenzo[a,j]phenazine-Cored Donor–Acceptor–Donor Triad

“…In other words, fluorescence and room-temperature phosphorescence (RTP) processes are involved in the electroluminescence. [40] In both cases, the RTP contribution in overall emission, which was estimated from the comparing the area of emission spectra acquired in aerated and degassed conditions, is higher than 90%, and therefore the mostly related factor for the efficiency of the device should be the phosphorescence process. The highest external quantum efficiency (EQE) of the OLEDs was obtained with PSeZ-DBPHZ-PSeZ (4.35%), where the device with tellurium derivative PTeZ-DBPHZ-PTeZ showed a lower EQE of 1.89% (Figure 6c).…”

Halide-containing organic persistent luminescent materials for environmental sensing applications

“…At present, many small molecules exhibiting OPL emission are developed, 11,13,56,57 such as difluoroboron (BF 2 )–chelates, 58 triazine, 59 boronic esters, 60–62 imide derivatives, 63 and sulfones. 64,65 Several representative small molecules are presented in this section, including the carbonyl compounds, carbazole compounds, organic halide salts, and sulfonyl derivatives.…”