Liu Ruxin, Zhang Wenjun, Liu Wenjing, Li Guojing
School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China.
Inorg Chem. 2021 Jul 19;60(14):10451-10458. doi: 10.1021/acs.inorgchem.1c01054. Epub 2021 Jun 28.
Lead-free perovskites have been widely studied due to their environmental friendliness and high stability. In this study, Bi-doped CsHfCl has been synthesized at room temperature. Different from the emission of the CsHfCl host (452 nm), Bi:CsHfCl can produce a bright blue emission at an excitation wavelength of 350 nm, which is derived from the P → S transition of Bi ions and accompanied by the properties of self-trapped excitons. Moreover, 7%Bi:CsHfCl shows excellent stability with the photoluminescence quantum yield reaching up to 69.08%. Meanwhile, a light-emitting diode that is close to pure white light has been fabricated by using 7%Bi:CsHfCl, which has a high color rendering index of 92.5. These results show that Bi:CsHfCl would be a potential candidate in the field of inorganic luminescent materials.
无铅钙钛矿因其环境友好性和高稳定性而受到广泛研究。在本研究中，Bi掺杂的CsHfCl已在室温下合成。与CsHfCl主体的发射（452 nm）不同，Bi:CsHfCl在350 nm的激发波长下可产生明亮的蓝色发射，这源于Bi离子的P→S跃迁，并伴随着自陷激子的特性。此外，7%Bi:CsHfCl表现出优异的稳定性，光致发光量子产率高达69.08%。同时，通过使用7%Bi:CsHfCl制备了一种接近纯白光的发光二极管，其显色指数高达92.5。这些结果表明，Bi:CsHfCl将是无机发光材料领域的一个潜在候选材料。
