Synthesis of a Bi3+-Doped Cs2HfCl6 Double Perovskite with Highly Efficient Blue Light Emission at Room Temperature

Ruxin Liu; Wenjun Zhang; Wenjing Liu; Guojing Li

doi:10.1021/acs.inorgchem.1c01054

Synthesis of a Bi³⁺-Doped Cs₂HfCl₆ Double Perovskite with Highly Efficient Blue Light Emission at Room Temperature

Inorg Chem. 2021 Jul 19;60(14):10451-10458. doi: 10.1021/acs.inorgchem.1c01054. Epub 2021 Jun 28.

Authors

Ruxin Liu¹, Wenjun Zhang¹, Wenjing Liu¹, Guojing Li¹

Affiliation

¹ School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China.

PMID: 34176258
DOI: 10.1021/acs.inorgchem.1c01054

Abstract

Lead-free perovskites have been widely studied due to their environmental friendliness and high stability. In this study, Bi³⁺-doped Cs₂HfCl₆ has been synthesized at room temperature. Different from the emission of the Cs₂HfCl₆ host (452 nm), Bi³⁺:Cs₂HfCl₆ can produce a bright blue emission at an excitation wavelength of 350 nm, which is derived from the ³P₁ → ¹S₀ transition of Bi ions and accompanied by the properties of self-trapped excitons. Moreover, 7%Bi³⁺:Cs₂HfCl₆ 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%Bi³⁺:Cs₂HfCl₆, which has a high color rendering index of 92.5. These results show that Bi³⁺:Cs₂HfCl₆ would be a potential candidate in the field of inorganic luminescent materials.