A zero-thermal-quenching phosphor Sr3La(AlO)3(BO3)4: Dy3+ for near ultraviolet excitation white-LEDs

The thermal stability of phosphor is a crucial factor for practical white-LED application since phosphor would suffer from emission loss due to non-radiative transition with increasing operational temperature. In this work, a single-host phosphor Sr3La(AlO)(3)(BO3)(4): Dy3+ has been synthesized via high-temperature solid-state reaction method. Interestingly, the phosphor performs prominent zero-thermal-quenching property from 298 K to 573 K, during which the emission intensity rises to 157% at 498 K and remains 138% even at 573 K in comparison that at room temperature instead of decrease. This particular phenomenon could be attributed to the energy transfer and trap mechanism arising from the high temperature. Moreover, under near ultraviolet excitation (352 nm), two main emission peaks located at 488 nm and 580 nm are observed, ascribed to transitions of Dy3+ ion from F-4(9/2) & RARR; H-6(15/2) and F-4(9/2) & RARR; H-6(13/2) respectively. Meanwhile, the effect of different Dy3+ content on the luminescence properties is investigated. Among these, 30 mol% of Dy3+ ions is found as the optimum concentration and the phosphor emits white light situated at (0.3298, 0.3786) in CIE coordinates. Based on the zero-thermal-quenching property and near ultraviolet excitation, the as-prepared Sr3La(AlO)(3)(BO3)(4): Dy3+ phosphor can be potential candidates in white-LEDs.

Automated summary

In this work, a highly thermally stable single-host phosphor Sr3La(AlO)(3)(BO3)(4): Dy3+ was synthesized. The phosphor exhibits prominent zero-thermal-quenching property and produces white light under near ultraviolet excitation, making it a potential candidate for white-LED applications.