Up-converted ultraviolet luminescence of Er3+:BaGd2ZnO5 phosphors for healthy illumination

doi:10.1007/s11706-016-0350-z

Front. Mater. Sci.

2016, Vol. 10

Issue (3) : 328-333 https://doi.org/10.1007/s11706-016-0350-z

COMMUNICATION

Up-converted ultraviolet luminescence of Er³⁺:BaGd₂ZnO₅ phosphors for healthy illumination

Ya ZHANG¹,Qingzhi CUI¹,Zhanyong WANG¹,Gan LIU²,Tian TIAN^1,^*(

),Jiayue XU^1,^*(

)

¹. Institute of Crystal Growth, School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
². Nanjing SKY Traffic Safety Technology Stock Co. Ltd., Nanjing 210014, China

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Abstract

Moderate level of exposure to the solar irradiation containing UV component is essential for health care. To incorporate the UV-emitting phosphors into the commercial YAG-based white light-emitting diode introduces the possibilities of healthy illumination to individuals’ daily lives. 1 mol.% Er³⁺-doped BaGd₂ZnO₅ (BGZ) particles were synthesized via sol–gel method and efficient up-converted luminescence peaked at 380 nm was detected under 480 nm excitation. The mixed phosphors with varied mass ratio of Er³⁺:BGZ and Ce³⁺:YAG particles were encapsulated to form LEDs. The study of the LEDs indicated that the introduction of BGZ component favored the enhancement of color-rendering index and the neutralization of the white light emitting. The WLED with the BGZ/YAG ratio of 8:2 was recommendable for its excellent overall white light luminous performances and UV intensity of 84.55 mW/cm². The UV illumination dose of the WLEDs with mixed YAG and BGZ was controllable by adjusting the ratio, the illumination distance and the illumination time. Er³⁺:BGZ phosphors are promising UV-emitting phosphors for healthy indoor illumination.

Keywords Er³⁺:BaGd₂ZnO₅ up-converted ultraviolet LED healthy illumination

Corresponding Author(s): Tian TIAN,Jiayue XU

Issue Date: 08 August 2016

Cite this article:

Ya ZHANG,Qingzhi CUI,Zhanyong WANG, et al. Up-converted ultraviolet luminescence of Er³⁺:BaGd₂ZnO₅ phosphors for healthy illumination[J]. Front. Mater. Sci., 2016, 10(3): 328-333.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0350-z
https://academic.hep.com.cn/foms/EN/Y2016/V10/I3/328

Fig.1 As-synthesized Er³⁺:BGZ powders: (a)(b)(c) SEM images with different magnifications; (d) XRD patterns of the typical sample and the standard data.

Fig.2 (a) UC and (b) DC luminescence spectra of Er³⁺:BGZ phosphors.

Fig.3 Schematic energy level diagram of Er³⁺ in BGZ exhibiting the possible mechanism of UC and DC luminescence of Er³⁺.

Fig.4 EL spectra from LED packages encapsulated with phosphors of varied composition. Samples a, b, c, d and e are mixtures with the YAG/BGZ mass ratios of 10:0, 9:1, 8:2, 7:3 and 0:10, respectively.

Fig.5 CIE coordinates of the varied LEDs.

Tab.1 The performance of the as-produced LEDs measured with the integrating sphere method

Fig.6 Pictures of lightened LED samples with the YAG/BGZ mass ratios of (a) 10:0, (b) 9:1, (c) 8:2, (d) 7:3 and (e) 0:10.

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