White-light emission in Yb3+/Er3+/Tm3+- and Yb3+/Er3+/Tm3+/Ho3+-doped α-NiMoO4nanoparticles

Schindra Kumar Ray; Bhupendra Joshi; Jin Hur

doi:10.1088/1361-6528/ac74cd

White-light emission in Yb³⁺/Er³⁺/Tm³⁺- and Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺-doped α-NiMoO₄nanoparticles

Nanotechnology. 2022 Jul 8;33(39). doi: 10.1088/1361-6528/ac74cd.

Authors

Schindra Kumar Ray¹, Bhupendra Joshi², Jin Hur¹

Affiliations

¹ Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea.
² Department of Fusion Science and Technology, Sun moon University, Tangjeong Myeon, 31460, Asan, Chungnam, Republic of Korea.

PMID: 35640433
DOI: 10.1088/1361-6528/ac74cd

Abstract

Yb³⁺/Er³⁺/Tm³⁺- and Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺-dopedα-NiMoO₄nanoparticles were synthesized using a microwave hydrothermal method and studied for white-light emission under 980 nm laser diode excitation. White upconversion (UC) light was successfully obtained with the appropriate control of blue, green, and red emissions by successfully tuning the Er³⁺and Ho³⁺concentrations in Yb³⁺/Er³⁺/Tm³⁺- and Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺-dopedα-NiMoO₄, respectively. In addition, the white color emission was shown by the CIE chromaticity coordinates of samples. The energy transfer mechanisms are explained in detail based on the emission spectra and pump power density-dependent UC luminescence intensity in rare earth (Yb³⁺/Er³⁺/Tm³⁺and Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺)-dopedα-NiMoO₄nanoparticles. The results indicate that Yb³⁺/Er³⁺/Tm³⁺- and Yb³⁺/Er³⁺/Tm³⁺/Ho³⁺-dopedα-NiMoO₄nanoparticles can be good candidates for white-light devices.

Keywords: nanoparticles; rare earth doping; upconversion; white light; α-NiMoO4.