The author of 《A color-tunable single molecule white light emitter with high luminescence efficiency and ultra-long room temperature phosphorescence》 were Ma, Xiao; Jia, Ling; Yang, Baozhu; Li, Jipeng; Huang, Wei; Wu, Dayu; Wong, Wai-Yeung. And the article was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices in 2021. Synthetic Route of C20H14N4 The author mentioned the following in the article:
Developing organic single mol. white light emitters (SMWLE) with high luminescence efficiency, ultra-long phosphorescence (ULP) and excitation-dependent (ED) color-tunable emission is intriguing and highly desirable from theor. research to practical application. Nevertheless, it is an extremely challenging topic. Here, it is found that three simple terpyridine-based derivatives (P1, P2 and P3) could exhibit unusual multiple emissions and interesting color-tunable emissions. In particular, P3 as the first example could simultaneously achieve bright white light emission with high quantum yield (49%), ultra-long phosphorescence (τ = 0.57 s) and ED color-tunable emission under ambient conditions. Accordingly, it can achieve novel multicolor emission including yellowish green light, white light, blue light, bluish green light and red phosphorescence light in a very wide wavelength range. Both exptl. and theor. studies reveal that such novel emission characteristics are due to the fact that P3 integrates monomer, excimer, and intermol. charge transfer (ICT) triple-mode emissions in the crystalline state. These results provide a rational strategy for the construction of SMWLE and ED color-tunable emission materials. Moreover, such simple multifunctional materials would show huge potential in displays, anti-counterfeiting, and so on. In the experimental materials used by the author, we found 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Synthetic Route of C20H14N4)
4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Synthetic Route of C20H14N4 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.