Reversible photochromic effect in natural gemstone sapphires

Tsung-Han Tsai, Zhen Wang & Hiroshi Takahashi
Photochromic sapphires show an optically controllable orange coloration under ambient temperature, which strongly affects the color appearance and market value of gemstone sapphires. An in-situ absorption spectroscopy combined with a tunable excitation light source has been developed to investigate the wavelength- and time dependence of sapphire’s photochromism. An excitation of ≤370 nm and ≥410 nm introduces and removes the orange coloration, respectively, accompanied by a stable absorption band at 470 nm. Both the color enhancement...
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