Wu Yibing, Zhuang Yixi, Xie Rong-Jun, Ruan Kaibin, Ouyang Xinhua
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R. China.
Dalton Trans. 2020 Mar 21;49(11):3606-3614. doi: 10.1039/d0dt00118j. Epub 2020 Mar 4.
Red emitters based on CaAlO:Mn have been attracting extensive attention due to their advantages of being rare-earth-free and chemically stable. However, their relatively low luminescence efficiencies will seriously hinder their application in light-emitting diodes (LEDs). In this regard, the promising red phosphors of CaAlO:Mn were synthesized with enhanced luminous efficiency by introducing the coexisting phase of MgAlO. Importantly, an approximately 5 times enhancement of integrated intensity in the emission spectrum was observed for the phosphor with the coexisting phase compared to that with a single phase. Their crystal structures, morphologies and photoluminescence properties and the mechanism of improved luminescence were systematically investigated. Upon exciting them by using near-ultraviolet or blue LEDs, an efficient red emission was achieved with a maximum peak at ∼658 nm. In order to evaluate their potential application, a warm white LED and a plant growth LED were fabricated by using the prepared phosphors in combination with YAG:Ce and InGaN-based blue chips.
基于CaAlO:Mn的红色发光体因其无稀土且化学稳定的优点而受到广泛关注。然而，它们相对较低的发光效率将严重阻碍其在发光二极管（LED）中的应用。在这方面，通过引入MgAlO共存相合成了发光效率提高的有前景的CaAlO:Mn红色荧光粉。重要的是，与单相荧光粉相比，观察到共存相荧光粉发射光谱的积分强度提高了约5倍。系统研究了它们的晶体结构、形貌、光致发光性能以及发光改善的机理。用近紫外或蓝色LED激发它们时，在~658 nm处实现了最大峰值的高效红色发射。为了评估它们的潜在应用，通过将制备的荧光粉与YAG:Ce和基于InGaN的蓝色芯片结合，制备了暖白色LED和植物生长LED。
