“…9,11 In the literature, there are only a limited group of compounds reported as NIR emitters, which largely include certain organic dyes and their derivatives such as cyanines, 2 phthalocyanines, 14 squarines, 15 BODIPYs, 16 rhodamines, 17 porphyrinoids, 18 as well as a number of donor–acceptor chromophores 1 and some rare-earth and transition metal complexes. 19,20 However, many of such compounds require difficult and expensive synthetic procedures. Therefore, the development of new classes of organic solid-state NIR emitters that can be crafted easily from simple building blocks is of utmost relevance.…”