Narrow-band red phosphors of high colour purity based on Eu3+-activated apatite-type Gd9.33(SiO4)6O2

Rodriguez-Garcia, Melissa Monzerrat; Ćirić, Aleksandar; Ristić, Zoran; Williams, J.A. Gareth; Dramicanin, Miroslav; Evans, Ivana Radosavljevic

Abstract

A series of new red phosphors based on apatite-type gadolinium silicate host, Gd9.33−xEux(SiO4)6O2 (0.03 < x < 1.87), have been synthesised and analysed. The phosphors show excellent chemical and thermal stability, losing only 10% of their emission intensity at 150 °C (working LED temperature) relative to that at room temperature through the electric dipole–dipole interaction. They exhibit efficient Eu3+ narrow-band red emission (quantum yield up to 75%; full-width at half-maximum (FWHM) = 7 nm; CIE colour coordinates x = 0.65, y = 0.35) of exceptional colour purity (94.2%), and the host can be heavily doped with Eu3+ (up to 10 at%) without concentration quenching of the emission. Variable-temperature powder X-ray diffraction, photoluminescence spectroscopy and Judd–Ofelt analysis of the phosphors’ radiative properties reveal the favourable influence of the structural properties of the apatite-type host on the efficiency and thermal stability of the Eu3+-activated Gd9.33(SiO4)6O2 emission.

Citation

Rodriguez-Garcia, M. M., Ćirić, A., Ristić, Z., Williams, J. G., Dramicanin, M., & Evans, I. R. (2021). Narrow-band red phosphors of high colour purity based on Eu3+-activated apatite-type Gd9.33(SiO4)6O2. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(23), 7474-7484. https://doi.org/10.1039/d1tc01330k

• Journal Article Type: Article
• Acceptance Date: May 4, 2021
• Online Publication Date: May 4, 2021
• Publication Date: Jun 21, 2021
• Deposit Date: May 11, 2021
• Publicly Available Date: Aug 12, 2021
• Journal: Journal of Materials Chemistry C Materials for optical and electronic devices
• Print ISSN: 2050-7526
• Electronic ISSN: 2050-7534
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 23
• Pages: 7474-7484
• DOI: https://doi.org/10.1039/d1tc01330k
• Public URL: https://durham-repository.worktribe.com/output/1275189