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

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Thermal quenching properties of narrow-band blue-emitting MBe2(PO4)2:Eu2+ (M = Ca, Sr) phosphors towards backlight display applications
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0qi00467g
Tao Hu _{1,

2,

3,

4,

5} , Yan Gao _{6,

7,

8,

9} , Xiaohong Ji _{1,

2,

3,

4,

5} , Zhiguo Xia _{1,

2,

3,

4,

5} , Qinyuan Zhang _{1,

2,

3,

4,

5}

Affiliation

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.

中文翻译：

窄带发蓝光的MBe2（PO4）2：Eu2 +（M = Ca，Sr）荧光粉的热猝灭特性，用于背光显示应用

发现具有窄带发射的新荧光粉对于液晶显示器（LCD）中的白光发光二极管（LED）至关重要。在此，成功地设计了近紫外（UV）激发窄带发蓝光MBe ₂（PO ₄）₂：Eu ²⁺（M = Ca，Sr）荧光粉，其半峰全宽为〜 26–27 nm，高色纯度〜99.1％，小斯托克斯位移〜1500 cm ^-1，理想的光致发光量子效率〜63.4％，甚至在高达〜300°C的温度下零热猝灭。较小的斯托克斯位移和狭窄的发射曲线基本上是由于刚性和有序连接[BeO ₄]和[PO ₄ ]四面体网络。同时，空前的热辐射行为归因于热活化光电离的抑制和从5d激发态的交点到Eu ²⁺的4f基态的非辐射路径。实现了高达88.6％NTSC的宽色域，证明了MBe ₂（PO ₄）₂：Eu ²⁺在LCD LCD背光源中的有效性。本研究鼓励研究人员通过为掺杂的稀土活化剂选择具有受限位点的坚硬有序的宿主，从而鉴定迄今尚未发现的窄带磷光体。

更新日期：2020-07-14

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