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Reidinger defects induced thermally stable green emission from Eu2+, Mn2+ co-doped Ba0.75Al11O17.25 transparent ceramics
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2021-09-17 , DOI: 10.1016/j.jeurceramsoc.2021.09.032
Zixin Wang 1 , Hui Lin 1 , Dawei Zhang 1 , Ruijin Hong 1 , Yanna Tian 2 , Jie Chen 2 , Shengming Zhou 2
Affiliation  

In this paper, Ba0.75Al11O17.25 was selected as the host for the Eu2+ and Mn2+ co-dopants due to the Reidinger defects in its lattice. Upon the 365 nm excitation, the phosphors presented the cyan to green tunable emission by changing the doping concentration of Mn2+. Moreover, this phosphor possesses zero-thermal quenching up to 448 K due to the interaction between the traps and Eu2+/Mn2+. The completely densified ceramic guaranteed the high optical transmittance (∼72 % at 516 nm) and thermal conductivity (4.3 W·m−1·K−1 at room temperature). When combined with a 6 W commercial 365 nm emitting LED chip, the temperature of the ceramic eventually stabilized at 428 K and the luminous efficacy of the LED device was almost not influenced by the thermal quenching effect. This work may open a way for exploring new phosphor conversion materials for HP/HB PC solid state lighting.



中文翻译:

Reidinger缺陷诱导Eu2+、Mn2+共掺杂Ba0.75Al11O17.25透明陶瓷的热稳定绿光发射

在本文中,由于其晶格中的 Reidinger 缺陷,Ba 0.75 Al 11 O 17.25被选为 Eu 2+和 Mn 2+共掺杂剂的主体。在 365 nm 激发下,荧光粉通过改变 Mn 2+的掺杂浓度呈现青色至绿色可调发射。此外,由于陷阱和 Eu 2+ /Mn 2+之间的相互作用,该磷光体具有高达 448 K 的零热猝灭。完全致密的陶瓷保证了高透光率(516 nm 时~72 %)和热导率(4.3 W·m -1 ·K -1在室温下)。当与 6 W 商用 365 nm 发光 LED 芯片结合时,陶瓷的温度最终稳定在 428 K,并且 LED 器件的发光效率几乎不受热猝灭效应的影响。这项工作可能为探索用于 HP/HB PC 固态照明的新型荧光粉转换材料开辟了道路。

更新日期:2021-10-22
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