Miniajluk-Gaweł Natalia, Bondzior Bartosz, Ptak Maciej, Dereń Przemysław Jacek
Institute of Low Temperature and Structure Research, Polish Academy of Science, Okolna 2, 50-422 Wroclaw, Poland.
Materials (Basel). 2024 Apr 19;17(8):1897. doi: 10.3390/ma17081897.
We present double-perovskite molybdate with the formula of BaMgMoO doped with Sm ions as a potential red phosphor to improve the color characteristics of white-light-emitting dioded (wLEDs). The new orange-red phosphor was synthesized using the co-precipitation (CP) method, and then its structural and spectroscopic properties were determined. Red emission at 642.6 nm dominates, which results from the electric dipole (ED) transition of the G → H type, and the materials are characterized by short luminescence decay times. BMM:Sm is, to our best knowledge, the clearest example of dominant red emission of Sm resulting from the location of the dopant in octahedral sites of high-symmetry cubic structure. In the sample containing 0.1% Sm, Sm ions are located in both Mg and Ba sites, while at higher concentrations the Ba site is less preferable for doping, as a result of which the emission becomes more uniform and single-site. The relative sensitivity calculated from FIR has a maximum of 2.7% K at -30 °C and another local maximum of 1.6% K at 75 °C. Such value is, to the best of our knowledge, one of the highest achieved for luminescent thermometry performed using only Sm ions. To sum up, the obtained materials are good candidates as red phosphor to improve the color characteristics of wLEDs, obtaining a color-rendering index (CRI) of 91 and coordinated color temperature (CCT) of 2943 K, constituting a warm white emission. In addition to this, a promising precedent for temperature sensing using high-symmetry perovskite materials is the high sensitivity achieved, which results from the high symmetry of the BMM host.
我们展示了化学式为BaMgMoO且掺杂了Sm离子的双钙钛矿钼酸盐，它作为一种潜在的红色荧光粉，用于改善白光发光二极管（wLED）的颜色特性。采用共沉淀（CP）法合成了这种新型橙红色荧光粉，然后测定了其结构和光谱性质。在642.6 nm处的红色发射占主导，这是由G→H型电偶极（ED）跃迁引起的，并且该材料的发光衰减时间较短。据我们所知，BMM:Sm是由于掺杂剂位于高对称立方结构的八面体位置而导致Sm产生主导红色发射的最清晰例子。在含有0.1% Sm的样品中，Sm离子同时位于Mg和Ba位置，而在较高浓度下，Ba位置不太适合掺杂，因此发射变得更加均匀且为单位置。从FIR计算得出的相对灵敏度在-30°C时最大为2.7% K，在75°C时另一个局部最大值为1.6% K。据我们所知，这样的值是仅使用Sm离子进行发光测温所达到的最高值之一。综上所述，所获得的材料是改善wLED颜色特性的红色荧光粉的良好候选材料，获得了91的显色指数（CRI）和2943 K的相关色温（CCT），构成暖白色发射。除此之外，使用高对称钙钛矿材料进行温度传感的一个有前景的先例是所实现的高灵敏度，这是由于BMM主体的高对称性所致。
