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Thermal quenching properties of narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors towards backlight display applications

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Abstract

Discovering new phosphors with narrow-band emission is critical for white light emitting diodes (LEDs) in liquid-crystal displays (LCDs). Herein, near-ultraviolet (UV) excitable narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors were successfully designed, exhibiting an extremely narrow full width at half-maximum of ∼26–27 nm, high color purity of ∼99.1%, small Stokes shift of ∼1500 cm−1, desirable photoluminescence quantum efficiency of ∼63.4%, and zero thermal quenching even at temperatures up to ∼300 °C. The small Stokes shift and narrow emission profile are fundamentally caused by the greatly suppressed structural relaxation benefiting from the rigid and ordered connected [BeO4] and [PO4] tetrahedra network. Meanwhile, the unprecedented thermal emission behavior is ascribed to the suppression of thermally activated photoionization and the non-radiative pathway from the cross-point of the 5d excited state to the 4f ground state of Eu2+. A wide color gamut reaching up to 88.6% NTSC is realized, demonstrating the validity of MBe2(PO4)2:Eu2+ in LED backlights for LCDs. The present studies encourage researchers to identify hitherto undiscovered narrow-band phosphors via selecting a stiff and ordered host with confined sites for doped rare earth activators.

Graphical abstract: Thermal quenching properties of narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors towards backlight display applications

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Article information


Submitted
22 Apr 2020
Accepted
06 Jun 2020
First published
08 Jun 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Thermal quenching properties of narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors towards backlight display applications

T. Hu, Y. Gao, X. Ji, Z. Xia and Q. Zhang, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00467G

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