Zero-dimensional organic–inorganic hybrid cadmium halides with broadband blue light emission

In recent years, low-dimensional organic–inorganic hybrid metal halides have been widely studied in optoelectronics owing to their broadband emission and high quantum yields. However, there has been limited progress in blue-emitting material development. To address this challenge, we prepared two new zero-dimensional (0D) cadmium-based hybrid halides, [MeOP]CdBr4 (MeOP = 1-(2-methoxyphenyl)piperazine) and [FPhP]CdBr4 (FPhP = 1-(2-fluorophenyl)piperazine) with blue broadband emissions, originating from the radiative recombination of self-trapped excitons (STEs). Furthermore, a stable white light-emitting diode (LED) was fabricated using [MeOP]CdBr4 as blue phosphor, which achieved a high color rendering index (CRI) of 95.4. This study not only introduces two new blue light-emitting hybrid materials but also highlights their potential in solid-state lighting applications.