Using boryl-substitution and improved Suzuki–Miyaura cross-coupling to access new phosphorescent tellurophenes

Abstract

New phosphorescent tellurophenes were derived from a di(isopropoxy)boryl tellurophene precursor and the Suzuki–Miyaura cross-coupling of borylated tellurophenes with 2-bromothiophene was investigated.

Persistent room temperature phosphorescence films based on star-shaped organic emitters

“…The large SOC constant contributes to the increase of the phosphorescent radiation transition rate and the non-radiative transition rate, which may lead to a decrease in τ P . 56,74,75 In addition, according to the EL-Sayed rule, reducing the (n, π*) proportion of the T 1 state will generate long lifetime RTP. 24,76 The electronic configurations of T 1 state of CzS and CzSe are hybrid mixture of (n, π*) and (π, π*), while CzO only has (π, π*) electronic configuration.…”

“…Although CzSe has the comparable reorganization energy with CzS, SOC constants of CzSe for phosphorescent radiation process are 8-fold higher than that of CzS, leading to the lower Φ P of CzSe, because the huge SOC constant will intensify the non-radiative transition. 56,74,75 As a consequence, CzS exhibits appropriate SOC, the favourable electronic configuration of T 1 , and lower reorganization energy, resulting in a higher Φ P along with moderate τ P in doped film.…”

Understanding the Role of Chalcogens in Ether‐Based Luminophores with Aggregation‐Induced Fluorescence and Phosphorescence

“…Compared to other recently described systems, no emission for the tellurium derivatives was found . This finding cannot be explained easily, and we investigated this behaviour by quantum chemical calculations (see last section).…”

Understanding the Role of Chalcogens in Ether‐Based Luminophores with Aggregation‐Induced Fluorescence and Phosphorescence

“…[23] Compared to other recently described systems, no emission for the tellurium derivatives was found. [24] This finding cannot be explained easily, and we investigated this behaviour by quantum chemical calculations (see last section).…”