Shi Lin-Ying, Zhao Dan, Zhang Rui-Juan, Zhu Shuang-Yin, Yu Meng-Han
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
Dalton Trans. 2022 Mar 1;51(9):3686-3694. doi: 10.1039/d1dt04393e.
The Eu ion, with the 4f5d electronic configuration, is one of the most important activated ions due to its symmetry-allowed 4f → 5d electron transition. Herein, we successfully prepared a new type of blue phosphor, NaCsMg(PO):Eu (NCMP:Eu), in which Eu occupies the Na sites of the host lattice. Under 395 nm light excitation, a broad emission band from 410 to 550 nm can be seen, peaking at 458 nm, due to the 5d → 4f transition of Eu. Moreover, Eu can be used as a sensitizer ion in an NCMP host. For co-doping phosphor NCMP:0.18Eu/0.4Mn, both Eu and Mn emission bands can be seen using 395 nm as the excitation wavelength for the occurrence of Eu → Mn charge transfer. The optimized concentration of Eu for NCMP:Eu is = 0.18, with high internal (IQE) and external quantum efficiencies (EQE) of 66.4% and 22.8%. The luminescence of NCMP:0.18Eu has high thermostability with 77.3% the intensity at 450 K compared to that at 300 K. Finally, a white illuminating lamp was produced using a 395 nm UV chip, blue phosphor NCMP:Eu, green phosphor (Sr,Ba)SiO:Eu and red phosphor CaAlSiN:Eu with CIE coordinates of (0.378, 0.369), color temperature (CCT) of 3971 K, and color rendering index () of 79.8.
具有4f5d电子构型的铕离子，由于其对称允许的4f→5d电子跃迁，是最重要的激活离子之一。在此，我们成功制备了一种新型蓝色荧光粉NaCsMg(PO):Eu (NCMP:Eu)，其中铕占据主体晶格的钠位点。在395 nm光激发下，由于铕的5d→4f跃迁，可以看到一个从410到550 nm的宽发射带，峰值在458 nm。此外，铕可以用作NCMP主体中的敏化剂离子。对于共掺杂荧光粉NCMP:0.18Eu/0.4Mn，使用395 nm作为激发波长时，可以看到铕和锰的发射带，这是由于发生了铕→锰的电荷转移。NCMP:Eu中铕的最佳浓度为 = 0.18，具有66.4%和22.8%的高内量子效率(IQE)和外量子效率(EQE)。NCMP:0.18Eu的发光具有高热稳定性，在450 K时的强度是300 K时的77.3%。最后，使用395 nm紫外芯片、蓝色荧光粉NCMP:Eu、绿色荧光粉(Sr,Ba)SiO:Eu和红色荧光粉CaAlSiN:Eu制作了一盏白色照明灯，其CIE坐标为(0.378, 0.369)，色温(CCT)为3971 K，显色指数()为79.8。
