Amarasinghe Dinesh K, Rabuffetti Federico A
Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
Inorg Chem. 2021 Mar 1;60(5):3165-3171. doi: 10.1021/acs.inorgchem.0c03513. Epub 2021 Feb 15.
The utility of Tb:Mn:NaMg(WO) phosphors as ratiometric luminescent thermometers in the 200-450 K temperature range is demonstrated. Targeted substitution of Tb for Na and Mn for Mg yields phosphors of formula NaTbMgMn(WO). UV excitation of the NaMg(WO) host results in green emission from terbium (544 nm) and red emission from manganese (682 nm). Differential thermal quenching of these emissions renders NaTbMgMn(WO) thermochromic between 78 and 450 K, with an orange-to-green color change that is particularly noticeable above 200 K. As a result, this phosphor serves as a ratiometric and colorimetric thermometer between 200 and 450 K. Quantitative assessment of its performance yields a maximum relative sensitivity of 2.5 × 10 K at 375 K, along with a resolution of 0.5 K and a repeatability of 98%. These findings highlight the versatility of NaMg(WO) as a platform to realize luminescent thermometers via targeted aliovalent substitutions.
证明了Tb:Mn:NaMg(WO) 荧光粉在200 - 450 K温度范围内作为比率发光温度计的实用性。用Tb替代Na以及用Mn替代Mg，得到了化学式为NaTbMgMn(WO) 的荧光粉。对NaMg(WO) 基质进行紫外激发会产生铽的绿色发射（544 nm）和锰的红色发射（682 nm）。这些发射的不同热猝灭使得NaTbMgMn(WO) 在78至450 K之间呈现热致变色，在200 K以上会有特别明显的从橙色到绿色的颜色变化。因此，这种荧光粉在200至450 K之间可作为比率和比色温度计。对其性能的定量评估得出，在375 K时最大相对灵敏度为2.5×10 K，分辨率为0.5 K，重复性为98%。这些发现突出了NaMg(WO) 作为通过定向异价取代实现发光温度计的平台的多功能性。
