Achieving high-efficiency purely organic room-temperature phosphorescence materials by boronic ester substitution of phenoxathiine

Abstract

The effect of boronic ester substitution on the room-temperature phosphorescence of phenoxathiine-based derivatives was investigated to achieve an improved phosphorescence quantum efficiency of up to 20%.

Boosting purely organic room-temperature phosphorescence performance through a host–guest strategy

“…The phosphorescence spectra are blue-shifted with decreasing temperature, which can be attributed to the suppressed configuration relaxation at low temperatures. 42 The structural features of fluorescence and phosphorescence can be attributed to the transitions of the molecular vibrational levels. It is noteworthy that the phosphorescence performance of 5H-BDTCz, 5H-BOTCz and 5H-iBOTCz is at variance with their respective 12H-isomers.…”

“…In our previous work, it has been proved that phenoxathiine and thianthrene show promising RTP emission. 42 Based on this, two sets of isomeric phenoxathiine and thianthrene derivatives were designed and synthesized, as shown in Fig. 1.…”

Persistent Room‐Temperature Phosphorescence from Purely Organic Molecules and Multi‐Component Systems

“…thoroughly investigated the RTP properties of boronic ester‐substituted phenoxathiine‐based derivatives i‐PXT‐BPin, PXT‐BPin, and TE‐BPin (Figure 5e). [ 55 ] However, it is noted that the efficiency of RTP was not always enhanced in the boronic esters examined. Only PXT‐BPin was found to have a high phosphorescence quantum yield (Φ p = 20%).…”

Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores

“…Unlike TADF molecules, of which the energy gap between lowest lying singlet and triplet states (ΔE S-T ) needs to be regulated 10 , organic molecules that are able to exhibit roomtemperature phosphorescence (RTP) are not limited to the ΔE S-T range that has to be thermally accessible [11][12][13][14] . Therefore, it is less demanding in the molecular design so long as one can reduce the non-radiative deactivation pathways in the triplet manifolds to boost RTP.…”

“…In yet another reserch direction, the long lifespan of RTP materials also shows potential applications in e.g., data encryption, optical recording devices, chemosensor, and bioimaging, etc. [11][12][13][14][17][18][19] .…”