Transparent glass with photochromism and luminescence has emerged as an attractive material due to its exciting prospects in the fields of information encryption and 3D optical storage. However, thermal stimulation has usually been used to bleach photochromic glass, limiting its applications. Herein, a new entirely photostimulation-induced reversible photochromic glass, doped with lanthanide ions and silver chloride (RE-Ag glass), was explored. Under the alternating stimulation of 365 nm light and a 690 nm laser, reversible photochromism (ΔR t = 91%) from transparent to black and luminescence modification (ΔR m = 93%) with high fatigue resistance were achieved in the RE-Ag glass. This is attributed to the formation and decomposition of silver nanoparticles in the glass host. The optical information can be recorded and erased in the RE-Ag glass with good rewritability and re-erasability, realizing a double-model 3D optical storage. The result highlights a new strategy to explore an entirely photostimulation induced photochromic glass with luminescence for 3D optical storage applications.
The
combination of X-ray-irradiation-induced photochromism and
persistent radioluminescence in a single material presents an exciting
avenue for multi-functional applications such as optical memory, anti-counterfeiting,
and X-ray detection and imaging. However, developing such a material
remains a significant challenge. Here, a white Ba3MgSi2O8:Mn2+ photochromic phosphor was prepared,
exhibiting a white-to-orange color change (>20 h for bright field)
and good persistent radioluminescence emission (>90 min for dark
field)
in response to X-ray radiation. The photochromic phosphor also demonstrated
accelerated bleaching and recovery after 14 min of 254 nm UV light
stimulation. This Ba3MgSi2O8:Mn2+-based flexible film displayed simultaneous reversible photochromism
and recoverable persistent luminescence, providing dual-mode X-ray
imaging and detection capabilities, as well as good reproducibility
and read/write erasability. This study suggests that combining X-ray-induced
photochromism and persistent radioluminescence in a single material
is a promising approach to design advanced photonic materials for
information security, cryptography, and smart anti-counterfeiting
applications.
Double perovskite (DP) phosphors attract extensive attention due to their potential applications in the field of optoelectronics. Photochromism‐induced luminescence modulation can extend their application fields. However, designing and preparing DP phosphors with expected photochromic and luminescent properties is still challenging. Herein, the photochromic Ba2YTaO6: Yb3+, Er3+, Co2+ DP with upconversion luminescence properties is developed. The color of the sample turns from white to pink upon 254 nm UV light irradiation, which is fast fading upon 473 nm laser illumination. The mechanism of photochromism is related to the formation of color centers, and the doping of Co2+ ions is crucial for the improvement of photochromism, which is from the increasing of traps depth, the oxygen vacancies, and the carrier concentration of the matrix caused by Co2+ doping. The upconversion luminescence of Er3+ ions can be reversibly modulated by the photochromic effect, exhibiting excellent reproducibility and high stability. The potential application of photochromic Ba2YTaO6: Yb3+, Er3+, Co2+ phosphor is demonstrated in the field of anticounterfeiting and three‐dimensional (3D) artwork. This work not only offers insight into the photochromic mechanism of DP but also presents guidance for developing other photochromic DP phosphors.
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