《Vibrational Radiationless Transition from Triplet States of Chromophores at Room Temperature》 was written by Hirata, Shuzo; Bhattacharjee, Indranil. Reference of fac-Tris(2-phenylpyridine)iridiumThis research focused onvibrational radiationless transition triplet states chromophores room temperature. The article conveys some information:
The radiationless transition rate based on intramol. vibrations from the lowest excited triplet state (T1) at room temperature [knr(RT)] is crucial for triplet energy harvesting in optoelectronics and photonics applications. Although a decrease of knr(RT) of chromophores with strong intermol. interactions is often proposed, scientific evidence for this has not been reported. Here, we report a method to predict knr(RT). We optically estimated knr(RT) of various molecularly dispersed chromophores with a variety of transition characteristics from T1 to the ground state (S0) under appropriate inert liquid or solid host conditions. Spin-orbit coupling (SOC) without considering mol. vibrations was not correlated with the estimated knr(RT). However, the estimated knr(RT) was strongly correlated with a multiplication of SOC considering vibrations freely allowed at room temperature and the Franck-Condon factor. This correlation revealed that knr(RT) of many heavy-atom-free chromophores with a visible T1-S0 transition energy and local excited T1-S0 transition characteristics is intrinsically less than 100 s-1 even when vibrations freely occur. This information will assist researchers to appropriately design materials without limitations regarding intermol. interactions to control T1 lifetime at room temperature and facilitate triplet energy harvesting. In the experiment, the researchers used many compounds, for example, fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6Reference of fac-Tris(2-phenylpyridine)iridium)
fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6) belongs to pyridine. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Additionally, pyridine-based natural products continue to be discovered and studied for their properties and to understand their biosynthesis.Reference of fac-Tris(2-phenylpyridine)iridium