Bright white upconversion luminescence in Ho3+/Yb3+/Tm3+ triple doped CaWO4 polycrystals

Xu, Yuheng; Wang, Yunlong; Shi, Liansheng; Xing, Lili; Xiang, Tao

doi:10.1016/j.optlastec.2013.05.005

Cited by 41 publications

(10 citation statements)

References 14 publications

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“…Therefore, the red emission around 630 nm corresponds to the 5 F 5 → 5 I 8 transition. 35,36) In Fig. 6, (A) Fig.…”

Section: Resultsmentioning

confidence: 99%

Microwave Sol-Gel Derived Ho3+/Yb3+ Co-Doped NaCaGd(MoO4)3 Phosphors and their Upconversion Photoluminescence

Lim

2016

J. Korean Ceram. Soc

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NaCaGd(MoO 4) 3 :Ho 3+ /Yb 3+ ternary molybdates were successfully synthesized by microwave sol-gel method for the first time. Well-crystallized particles formed after heat-treatment at 900°C for 16 h showed a fine and homogeneous morphology with particle sizes of 3-5 μm. Under excitation at 980 nm, the UC intensities of the doped samples exhibited strong yellow emissions based on the combination of strong emission bands at the 520-nm and 630-nm emission bands in the green and red spectral regions, respectively. The strong 520-nm emission band in the green region corresponds to the 5 S 2 / 5 F 4 → 5 I 8 transition of Ho 3+ ions, while the strong 630-nm emission band in the red region appears to be due to the 5 F 5 → 5 I 8 transition of the Ho 3+ ions. The optimal Yb 3+ :Ho 3+ ratio was found at 9:1, as indicated by the composition-dependent quenching effect of Ho 3+ ions. The pump power dependence of the upconversion emission intensity and the Commission Internationale de L'Eclairage chromaticity coordinates of the phosphors were evaluated in detail.

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“…Therefore, the red emission around 630 nm corresponds to the 5 F 5 → 5 I 8 transition. 35,36) In Fig. 6, (A) Fig.…”

Section: Resultsmentioning

confidence: 99%

Microwave Sol-Gel Derived Ho3+/Yb3+ Co-Doped NaCaGd(MoO4)3 Phosphors and their Upconversion Photoluminescence

Lim

2016

J. Korean Ceram. Soc

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“…Therefore, the red emission around 655 nm corresponds to the 5 F 5 → 5 I 8 transition. [31][32][33] The well-resolved sharp peaks for the KY(WO 4 ) 2 particles indicate the high crystallinity state of the synthesized particles. The internal vibration frequencies are dependent on the lattice parameters and the strength of the partially covalent bond between the cations and the molecular ionic groups of WO x .…”

Section: Resultsmentioning

confidence: 95%

Microwave-Modified Sol-Gel Process for Microcystalline KY(WO4)2: Ho3+/Yb3+ Phosphors and their Upconversion Photoluminescence Properties

Lim¹

2015

Journal of the Korean Ceramic Society

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KY 1-x (WO 4) 2 :Ho 3+ /Yb 3+ yellow phosphors with doping concentrations of Ho 3+ and Yb 3+ (x = Ho 3+ + Yb 3+ , Ho 3+ = 0.05, 0.1, 0.2 and Yb 3+ = 0.2, 0.45) were successfully prepared using the microwave-modified sol-gel method; their upconversion (UC) photoluminescence properties were investigated in detail. Well-crystallized particles, formed after heat-treatment at 900°C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2-5 µm. Under excitation at 980 nm, the UC KY 0.7 (WO 4) 2 :Ho 0.1 Yb 0.2 and KY 0.5 (WO 4) 2 Ho 0.05 Yb 0.45 particles exhibited excellent yellow emissions based on a strong 545-nm emission band in the green region and a very strong 655-nm emission band in the red region. Pump power dependence and Commission Internationale de L'Eclairage chromaticity of the UC emission intensity were evaluated. The spectroscopic properties were examined comparatively using Raman spectroscopy.

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“…The Ho 3 þ in 5 I 7 level is excited to the 5 F 5 level by the energy transfer from Yb 3 þ . Therefore, the red emission around 655 nm is corresponding to the 5 F 5 -5 I 8 transition [20,21]. The Raman spectra of doped particles prove that the doping ions can influence the structure of the host materials.…”

Section: Resultsmentioning

confidence: 97%

Microwave-modified sol-gel process of NaY(WO4)2: Ho3+/Yb3+ phosphors and the upconversion of their photoluminescence properties

Lim

2015

Ceramics International

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Bright white upconversion luminescence in Ho3+/Yb3+/Tm3+ triple doped CaWO4 polycrystals

Cited by 41 publications

References 14 publications

Microwave Sol-Gel Derived Ho3+/Yb3+ Co-Doped NaCaGd(MoO4)3 Phosphors and their Upconversion Photoluminescence

Microwave Sol-Gel Derived Ho3+/Yb3+ Co-Doped NaCaGd(MoO4)3 Phosphors and their Upconversion Photoluminescence

Microwave-Modified Sol-Gel Process for Microcystalline KY(WO<sub>4</sub>)<sub>2</sub>: Ho<sup>3+</sup>/Yb<sup>3+</sup> Phosphors and their Upconversion Photoluminescence Properties

Microwave-modified sol-gel process of NaY(WO4)2: Ho3+/Yb3+ phosphors and the upconversion of their photoluminescence properties

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