Efficient narrowband electroluminescence based on a hetero-bichromophore thermally activated delayed fluorescence dyad was written by Yu, You-Jun;Zou, Sheng-Nan;Peng, Chen-Chen;Feng, Zi-Qi;Qu, Yang-Kun;Yang, Sheng-Yi;Jiang, Zuo-Quan;Liao, Liang-Sheng. And the article was included in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2022.Quality Control of 2,5-Dibromo-1,3-dimethylbenzene This article mentions the following:
A hetero-bichromophore thermally activated delayed fluorescence (TADF) emitter named BOQAO was designed and synthesized, which consists of two multi-resonance TADF (MR-TADF) cores, tBuBO and tBuQAO. The short-range intramol. charge transfer (ICT) characteristics of tBuBO and tBuQAO weaken its electron-donating and electron-withdrawing ability, resp. Thus, weak long-range ICT from tBuBO to tBuQAO is established in BOQAO for holding blue fluorescence emission with a slight red shift, keeping a small FWHM, and maintaining the TADF properties, simultaneously. The simple doped devices exhibited high color purity with FWHMs of less than 35 nm in a wide doping ratio range from 1 wt% to 40 wt%. At a 5 wt% doping ratio, the device based on BOQAO exhibited the best device performance with an EQE of 21.8% and an FWHM of 32 nm. This work provides a simple and practical strategy for suppressing aggregation-induced spectral broadening for the development of MR-TADF. In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Quality Control of 2,5-Dibromo-1,3-dimethylbenzene).
2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Quality Control of 2,5-Dibromo-1,3-dimethylbenzene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary