Issue 77, 2016, Issue in Progress

Mechanism for anomalous luminescence behaviour of Eu2+-doped red-emitting magnesium nitride phosphors

Abstract

A series of novel red-emitting phosphors Mg3−xN2:xEu2+ (0 ≤ x ≤ 0.08) were successfully synthesized by solid-state reactions at low temperature. The grains of the resulting phosphors showed good dispersibility with diameters of about 14–20 μm; some needle-like crystals gradually increased in length and thickness as the sintering time increased. The excitation spectra of the Mg3N2:Eu2+ phosphors showed strong excitation in the range 250–450 nm, with a dominant excitation peak around 428 nm. At excitation wavelengths <428 nm, the phosphors exhibited a broadband red emission peaking at about 612 nm with a tail on the long wavelength side. The emission peak positions of the Mg3−xN2:xEu2+ (0 ≤ x ≤ 0.08) phosphors shifted from 621 to 609 nm as the Eu2+ concentration increased and the emission intensity was at a maximum at x = 0.05. The mechanism of the shift in emission was explained by adjusting the cationic composition of the phosphors. The emission peaks of Mg3N2:Eu2+ were influenced by the nephelauxetic effect, the crystal field environment and the Stokes shift. Based on experimental data, we propose an underlying mechanism of thermal quenching and elucidated the large thermal quenching of Mg3N2:Eu2+ using a configurational coordinate diagram. These results indicate that Mg3N2:Eu2+ could be used in the development of white light-emitting diodes.

Graphical abstract: Mechanism for anomalous luminescence behaviour of Eu2+-doped red-emitting magnesium nitride phosphors

Article information

Article type
Paper
Submitted
30 May 2016
Accepted
06 Jul 2016
First published
19 Jul 2016

RSC Adv., 2016,6, 73063-73069

Mechanism for anomalous luminescence behaviour of Eu2+-doped red-emitting magnesium nitride phosphors

Q. Long, Y. Li and Y. Wang, RSC Adv., 2016, 6, 73063 DOI: 10.1039/C6RA14048C

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