Near-infrared luminescence phosphors are key material basis to potential applications for light sources and optoelectronic devices. In particular, it is vital to tune the luminescent properties of these phosphors in a flexible and controllable manner. Here, we demonstrate that a flexural strain originated from bending can be used to modulate the photoluminescence of freestanding Ni2+ doped SrTiO3 membranes. The bent membranes show remarkable red-shift emissions, arising from the variations of the symmetry of host materials and the local crystal fields around the Ni2+ ions. In addition, the phosphor films show a reversible and stable wavelength modulation with remarkable anti-fatigue characteristics after 104 bending cycles. These results provide a potential routine to develop flexible strain-tunable devices for applications in optical amplifiers and other optoelectronics.
Tunable-wavelength photoluminescence of a flexible transition metal doped oxide phosphor thin film
Zhengang Dong, Jiaying Shen, Fan Zhang, Yaping Qi, Yang Zhang, Gongxun Bai, Zhenping Wu, Danfeng Li; Tunable-wavelength photoluminescence of a flexible transition metal doped oxide phosphor thin film. Appl. Phys. Lett. 27 March 2023; 122 (13): 132908. https://doi.org/10.1063/5.0147266
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