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Preparation and luminescent properties of a novel orange-red phosphor Sr2RE8(SiO4)6O2:Eu(2+,3+) (RE = Y, Gd, La) for LEDs

Fei Wang, Huihui Chen, and Shiwei Zhang

Experimental Center of Anhui Sanlian University, Anhui Sanlian University, Hefei, People’s Republic of China

 

E-mail: wangfchina@163.com

Received: 12 March 2021  Accepted: 30 June 2021

Abstract:

A series of novel orange-red Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+) (RE = Y, Gd, La) phosphors were synthesized by high-temperature solid-phase reaction method, all of which are apatite structure, belonging to hexagonal crystal system. The cell parameters (a, c) and cell volume (V) of Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+) decrease with the substitution of RE3+ by La3+, Gd3+ and Y3+, respectively, and the crystal size decreases from 64.8309 to 49.0382 nm. The excitation spectra of Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+) phosphors are a broadband in the range of 200–600 nm, which can be attributed to the CTS of Eu3+ and the d–f transition of Eu2+. When RE3+ in the matrix is replaced by La3+, Gd3+ and Y3+, respectively, the charge transfer band of Eu3+ generates bathochromic shift from 265 to 275 nm, and the broadband of the excitation spectrum of Eu2+ is red shifted from 320.5 to 336 nm. The emission spectra of Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+) phosphors in the range of 500–750 nm are a set of strong sharp line spectra, which are inconsistent with emission broadband spectrum of Eu2+ allowing electric dipole transition, mainly including the transition of 5D0, 5D1, 5D2 → 7FJ from Eu3+. This result indicates that Eu2+ can efficiently transfer energy to Eu3+ and Sr1.9La8(SiO4)6O2:0.1Eu(2+,3+) exhibits the highest transfer efficiency. Importantly, the color coordinates of Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+)(RE = Y, Gd, La) are all in the orange-red light range, and the color temperature is lower than 1800 K with a high color rendering index (CRI ≥ 75), which is suitable for the phosphor of white LED excited by UV chip.

Keywords: LED; Sr1.9RE8(SiO4)6O2:0.1Eu(2+,3+); Orange-red; Crystal structure; Luminescent properties

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01770-0

 

Chemical Papers 75 (11) 5803–5811 (2021)

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