White Light/Tunable Emissions Properties in the ZnW1−xMoxO4:Eu3+ Phosphors for UV and near-UV Converted LEDs

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● White Light/Tunable Emissions Properties in the ZnW1−xMoxO4:Eu3+ Phosphors for UV and near-UV Converted LEDs
Author(s)
Weiguang Ran
Affiliation(s)
Department of Physics, Pukyong National University, Busan 48513, South Korea
KEYWORDS
White Light/Tunable Emissions Properties, ZnW1−xMoxO4:Eu3+ Phosphors, UV, near-UV Converted LEDs
ABSTRACT
A series of the ZnW1−xMoxO4:0.03Eu3+ phosphors were synthesized through solid-state reaction process. The structure, ultraviolet-visible diffuse reflectance spectra, photoluminescence and decay properties of the phosphors were investigated as a function of the W/Mo ratio. The experimental spectroscopic results show the excitation bands of these phosphors is in the near ultraviolet region; the red-shift of the excitation band is observed upon increase of the Mo concentration. Co-doping with Mo can enhance the luminescent intensity and the optimal concentration was determined to be x=0.6. The combination of the first-principles calculations with the experimental spectroscopic measurements confirmed an indirect band gap character for the prepared phosphors and allowed for estimation of their band gap value. Energy transfer process was also discussed considering the overlap between the emission spectrum of Mo(W)O6 groups and the absorption spectrum of Eu3+ ions. The obtained results show that the ZnW1−xMoxO4:0.03Eu3+ phosphors have considerable potential for the near ultraviolet excited white light emitting diodes.