Abstract
Deep-trap luminescent materials have attracted great attention for optical information storage applications. However, the flexible luminescence films based on red luminescence materials with temperature and infrared response are scarce. In this study, we have successfully developed various novel flexible red emitting films based on Eu2+/Dy3+ co-doped Sr2Si5N8 phosphors through screen-printing and spin-coating technologies, respectively. Interestingly, the fabricated flexible luminescence films exhibit unique temperature and infrared responsive properties for optical information storage by releasing photons in response to thermal or infrared stimulation. Notably, deep-trap red emitting Eu2+/Dy3+ co-doped Sr2Si5N8 phosphors are crucial for the optical information storage properties of the films. Two emission peaks of Sr2Si5N8:Dy3+ phosphors at 476 nm and 577 nm are observed under excitation at 345 nm, corresponding to the radiative transition occurs from the 4F9/2 level to the 6H13/2 and 6H15/2 levels of Dy3+. When Dy3+ and Eu2+ ions are co-doped in Sr2Si5N8, the energy transfer from Dy3+ to Eu2+ in Sr2Si5N8 matrix is found and the decay time confirms that Dy3+ ions can be acted as deep trap centers to storage photons. For Sr2Si5N8:Eu2+,Dy3+ phosphors and the corresponding flexible luminescence films, the specific patterns (for example apple and note patterns) are firstly recorded under NUV or blue light excitation and then reappear through thermal stimulation or near-infrared photo-stimulation (980 nm laser). This work not only validates the feasibility of Sr2Si5N8:Eu2+,Dy3+ phosphors as deep-trap red emitting luminescence materials, but also suggests the applications of flexible luminescence films for optical information storage.
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