Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7140326 | Sensors and Actuators B: Chemical | 2018 | 23 Pages |
Abstract
The first demonstration of using V-based phosphor as a luminescent temperature sensor is presented. The luminescent properties of YAG:V3+, V5+ and YAG:V Ln3+ (Ln3+â¯=â¯Eu3+, Nd3+ and Dy3+) nanocrystals were investigated in a wide range of temperature (-150â¯Â°C-300â¯Â°C). The influence of dopant concentration and size of the nanocrystals on the emission color output of the YAG:V3+, V5+ was analyzed. The provided analysis reveals that V3+ and V5+ are mainly localized in octahedral sites of Al3+ of core part of the nanocrystals and surface tetrahedral sites of Al3+, respectively. The emission spectra consists of two broad emission bands, attributed to the CT emission of V5+ (at 520â¯nm) and 3T2gâ¯ââ¯3T1g electronic transition emission of V3+(at 820â¯nm). It was found that emission color output of the YAG:V3+, V5+ nanocrystals can be modulated either by the vanadium concentration or by the size of nanocrystals. Based on the V3+ to V5+ emission intensity ratio (LIR) in the temperature range from â150â¯Â°C to 300â¯Â°C self-reference thermometer was defined, which reveals 0.7%/°C of sensitivity at the physiological temperature and increases above 4% in 250-300â¯Â°C. However its usable temperature range was strongly restricted. It was showed that by the appropriate choice of lanthanide co-dopants, the temperature range in which high sensitivity can be modulated (0.4%/°C at 100â¯Â°C for YAG:V,Eu3+; 4%/°C at â150â¯Â°C for YAG:V,Dy3+; and 0.8%/°C at 300â¯Â°C for YAG:V,Nd3+).
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Authors
K. Kniec, L. Marciniak,