Chen Fan, Akram Muhammad Nadeem, Chen Xuyuan
Department of Microsystems, Faculty of Technology, Natural Sciences and Maritime Sciences, Campus Vestfold, University of South-Eastern Norway, 3184 Borre, Norway.
Micromachines (Basel). 2023 Aug 15;14(8):1605. doi: 10.3390/mi14081605.
The integration of trivalent europium ion (Eu)-doped zinc molybdate (ZnMoO) as red phosphors in next-generation solid-state lighting (SSL) is impeded by their extended electron lifetime and suboptimal thermal stability. To overcome these limitations, we propose a co-doping approach by incorporating Mn and Eu in ZnMoO, aiming to improve thermal reversibility and reduce the lifetime of electron transitions. A series of Eu-doped ZnMoO and Mn/Eu-co-doped ZnMoO phosphor materials were synthesized via the conventional sol-gel method, and their photoluminescence properties were compared under high-temperature conditions. Experimental results indicate that the introduction of Mn into Eu-doped ZnMoO leads to a decrease in quantum efficiency and electron lifetime, primarily attributed to defects within the crystal lattice and energy transfer from Eu to Mn, resulting in enhanced non-radiative transitions. However, the addition of a small quantity of Mn remarkably improves the thermal stability and reversibility of the phosphors. Consequently, this co-doping strategy presents a promising avenue for expanding the application possibilities of phosphor materials, particularly for high-power SSL applications subjected to elevated temperatures. Hence, Eu-only doped samples are well-suited for lighting applications due to their high IQE and excellent thermal stability. Conversely, Eu/Mn-co-doped samples show promise in applications that require a shorter electron lifetime and good reversibility.
三价铕离子（Eu）掺杂的钼酸锌（ZnMoO）作为红色荧光粉应用于下一代固态照明（SSL）时，其电子寿命延长和热稳定性欠佳阻碍了该应用。为克服这些限制，我们提出一种共掺杂方法，即在ZnMoO中同时掺入Mn和Eu，旨在提高热可逆性并缩短电子跃迁寿命。通过传统溶胶 - 凝胶法合成了一系列Eu掺杂的ZnMoO和Mn/Eu共掺杂的ZnMoO荧光粉材料，并在高温条件下比较了它们的光致发光性能。实验结果表明，在Eu掺杂的ZnMoO中引入Mn会导致量子效率和电子寿命降低，这主要归因于晶格中的缺陷以及从Eu到Mn的能量转移，从而增强了非辐射跃迁。然而，添加少量Mn可显著提高荧光粉的热稳定性和可逆性。因此，这种共掺杂策略为扩大荧光粉材料的应用可能性提供了一条有前景的途径，特别是对于高温下的高功率SSL应用。因此，仅Eu掺杂的样品因其高内部量子效率（IQE）和出色的热稳定性而非常适合照明应用。相反，Eu/Mn共掺杂的样品在需要较短电子寿命和良好可逆性的应用中显示出潜力。
