Eu<SUP>3+</SUP>-doped Bi<sub>2</sub>MoO<sub>6</sub> phosphors for highly sensitive and visible H<sub>2</sub>S 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 from10 ppm, and the emission intensity exponentially decreased with increasing the concentration until 500 ppm. (C) 2021 Optical Society of America