近日，2022级硕士研究生唐嘉丽以第一作者在Adv. Opt. Mater.上发表题为“Killing Three Birds with One Stone: Energy Transfer Inducing Efficient, Zero Thermal Quenching, and Emission-Color Tunable Phosphors”的学术论文，通讯作者为张吉林副教授。

论文摘要：Red emission phosphors with high efficiency and excellent thermal stability are essential for phosphor-converted light-emitting diodes (pc-LEDs). Na₂MgPO₄F: Mn²⁺ shows a very weak red emission peak at 615 nm due to 3d-3d forbidden transition. And it exhibits a normal thermal quenching behavior. Blue-emitting Eu²⁺ with anti-thermal quenching (ATQ) is introduced to tune the emission color, emission efficiency, and thermal stability of Mn²⁺ in Na₂MgPO₄F. The emission color of Na₂MgPO₄F: Eu²⁺, Mn²⁺ phosphors can be tuned by increasing the Mn²⁺ content. The internal and external quantum efficiencies of Na₂MgPO₄F:0.03Eu²⁺, 0.05Mn²⁺ are 89.3% and 41.1%, respectively, which are much higher than those of the Mn2+-doped ones. Furthermore, the ATQ effect of Eu²⁺ is also transferred to Mn²⁺ via energy transfer, which results in Na₂MgPO₄F: Eu²⁺, Mn²⁺ phosphors with zero thermal quenching (ZTQ). The cooperation of energy transfer, enhanced absorption, and increased defects amount promotes the achievement of ZTQ in the co-doped samples. Two white pc-LEDs with a color rendering index of more than 90 are manufactured by using the as-synthesized Na₂MgPO₄F: Eu²⁺, Mn²⁺ phosphors combined with near-UV chips. This study not only provides high-performance Eu²⁺, Mn²⁺ co-doped phosphors suitable for high-quality solid-state lighting, but also exhibits a killing-three-birds-with-one-stone strategy to obtain efficient, thermally stable, and color-tunable phosphors.

 论文链接：https://onlinelibrary.wiley.com/doi/10.1002/adom.202401811