Multicolor Upconversion Emission Tuning of NaY(WO4)2: Dy3+ via Er3+ Doping

doi:10.15541/jim20170310

Abstract

Abstract:

A series of Dy³⁺and Er³⁺ co-doped NaY(WO₄)₂ phosphors were synthesized by hydrothermal reactions. X-ray diffraction and scanning electron microscope were used to characterize their crystal structure and morphology. The upconversion luminescent properties and the fluorescence lifetime of ⁴F_9/2→⁶H_13/2 transition of the Dy³⁺ ion were also investigated. Moreover, the energy transfer from Dy³⁺ to Er³⁺ ions in NaY(WO₄)₂: Dy³⁺, Er³⁺ was analyzed in detail. The results indicated that all the samples had pure tetragonal crystal structure. Furthermore, the micrometer- sized needle spheres and excellent dispersion of the particles were obtained by adding polyethylene glycol (PEG-2000) as surfactant. Under near infrared light excitation at 780 nm, the NaY(WO₄)₂: Dy³⁺, Er³⁺ samples exhibited blue emission at 480 nm (⁴F_9/2→⁶H_15/2 transition of Dy³⁺), yellow emission at 576 nm (⁴F_9/2→⁶H_13/2 transition of Dy³⁺) and green emission at 531 and 554 nm (²H_11/2→⁴I_15/2 and ⁴S_3/2→⁴I_15/2 transition of Er³⁺, respectively). The energy transfer process from Dy³⁺ to Er³⁺ is a resonant transfer, in which electric dipole-dipole interaction plays a leading role. By adjusting the doping concentration of Er³⁺ in NaY(WO₄)₂: 1.0mol% Dy³⁺, xmol% Er³⁺ phosphors, conversion from quasi white light to blue light can be realized.

Key words: up-conversion luminescence, NaY(WO₄)₂: Dy³⁺, Er³⁺, polyethylene glycol, energy transfer

CLC Number:

TB321

SHI Zhong-Xiang, WANG Jing, GUAN Xin. Multicolor Upconversion Emission Tuning of NaY(WO₄)₂: Dy³⁺ via Er³⁺ Doping[J]. Journal of Inorganic Materials, 2018, 33(5): 521-527.

Figures/Tables 10

Fig. 1 (a) XRD patterns of NaY(WO4)2 : 1.0mol% Dy3+, xmol% Er3+(x=0-10.0) samples and the standard card of NaY(WO4)2; (b) amplified (112) diffraction peaks

Fig. 2 (a) SEM image of NaY(WO4)2: Dy3+, Er3+ phosphors without PEG-2000; (b)-(d) Different magnification SEM images of NaY(WO4)2: Dy3+, Er3+ phosphors with PEG-2000

Fig. 3 Excitation spectrum of NaY(WO4)2: Er3+, Dy3+ sample (λem=576 nm)

Fig. 4 Upconversion emission spectra of NaY(WO4)2: 1.0mol% Dy3+ and NaY(WO4)2: 1.0mol% Dy3+, 3.0mol% Er3+ samples

Fig. 5 Upconversion emission spectra of NaY(WO4)2: 1.0mol% Dy3+, xmol% Er3+ (x=1.0-10.0) samples

Fig. 6 Decay curves of 576 nm in NaY(WO4)2: 1.0mol% Dy3+, xmol% Er3+ (x=0-10.0) samples

Fig. 7 Dependence of lifetime of Dy3+ on energy transfer efficiency in NaY(WO4)2: 1.0mol% Dy3+, xmol% Er3+ (x=0-10.0) samples

Fig. 8 Dependence of Dy3+ on (a) C 6/3, (b) C 8/3 and (c) C 10/3 in NaY(WO4)2: Dy3+, Er3+

Fig. 9 Upconversion luminescence mechanism of NaY(WO4)2: Dy3+, Er3+ samples

Fig. 10 CIE chromaticity diagram of NaY(WO4)2: 1.0mol% Dy3+, xmol% Er3+ (x=0-10.0) samples

References 18

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Multicolor Upconversion Emission Tuning of NaY(WO₄)₂: Dy³⁺ via Er³⁺ Doping

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