Abstract
Under 980 nm diode laser excitation, efficient upconversion emissions from the Ho3+/Yb3+ codoped CaWO4 phosphor were obtained. The upconversion quantum efficiency was evaluated to be about 3.3% when the power density of the excitation laser was 47 W/cm2. Additionally, temperature dependent blue emissions from the 5F 2,3/3K8 and 5G6/ 5F1 states of Ho3+ ions were studied in the range of 303-923 K. The result demonstrated that using the ratio between the blue luminescence intensities of Ho3+ ions, the sensitivity and the accuracy for optical thermometry achieved here are superior to the previously reported Er3+ green fluorescence based optical temperature sensors.
Original language | English (US) |
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Pages (from-to) | 1096-1100 |
Number of pages | 5 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 188 |
DOIs | |
State | Published - 2013 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry