Eu3+-doped Bi2MoO6 phosphors for highly sensitive and visible H2S gas indicator material: optical and color properties, and gas sensing performance

Abstract

Bi₂MoO₆:Eu³⁺ phosphors were synthesized by a solid state reaction, and H₂S gas sensing performance was investigated. The Bi₂MoO₆:Eu³⁺ phosphors showed an excellent red emission due to f-f transition of Eu³⁺. Owing to the exposure to H₂S gas, the emission intensity of the phosphors dramatically decreased to 40% of the initial value. The body color of the phosphor changed from yellow-white to dark brown. The response of the Bi₂MoO₆:Eu³⁺ phosphors for H₂S gas was started from 10 ppm, and the emission intensity exponentially decreased with increasing the concentration until 500 ppm.