Rare-earth doped solid-state phosphor with temperature-induced variable chromaticity

Artur S. Gouveia-Neto; Luciano A. Bueno; Raphael Nascimento; Elias A. Silva; Ernande B. Costa

doi:10.1117/12.806703

23 February 2009 Rare-earth doped solid-state phosphor with temperature-induced variable chromaticity

Artur S. Gouveia-Neto, Luciano A. Bueno, Raphael Nascimento, Elias A. Silva, Ernande B. Costa

Author Affiliations +

Proceedings Volume 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII; 719713 (2009) https://doi.org/10.1117/12.806703
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

A temperature induced variable chromaticity phosphor based upon a rare-earth multi-doped solid-state frequency upconverter is presented. The phosphors are composed of ytterbium-sensitized multiple doped(Tm, Er, Ho) lead-cadmium fluorogermanate glass samples excited by a laser source around 1064 nm. The temperature induced color variation exploits the heat enhanced effective absorption cross-section of the ytterbium sensitizer under multiphonon-assisted anti-Stokes excitation. The temperature enhancement of the energy-transfer mechanism between the sensitizer and the appropriate active light emitter ion allows the selective intensity control of the RGB emission wavelengths due to different upconversion excitation routes. The suitable combination of rare-earth active ions yielded the generation of variable chromaticity light with CIE-1931 coordinates changing from CIE-X=0.283;Y=0.288 at 20°C to CIE-X= 0.349;Y=0.412 at 190 °C, and CIE-X=0.285;Y=0.361 at 25°C to CIE-X=0.367;Y=0.434 at 180°C in Yb³⁺/Tm³⁺/Ho³⁺ and Yb³⁺/Tm³⁺/Er³⁺ multidoped samples, respectively. The viability of producing a low cost solid-state changeable visible color remote distributed temperature indicator in the 25°C - 300°C range is also discussed.

Citation Download Citation

Artur S. Gouveia-Neto, Luciano A. Bueno, Raphael Nascimento, Elias A. Silva, and Ernande B. Costa "Rare-earth doped solid-state phosphor with temperature-induced variable chromaticity", Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 719713 (23 February 2009); https://doi.org/10.1117/12.806703

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