Optical data storage technology has many advantages over the traditional solid-state and magnetic storage technology,such as low cost,multi-dimensional storage,and rewritable capability.Therefore,the optical data stor...Optical data storage technology has many advantages over the traditional solid-state and magnetic storage technology,such as low cost,multi-dimensional storage,and rewritable capability.Therefore,the optical data storage technology has been in increasing demand for optical storage media.Herein,the photochromic and photoluminescence properties of BaMgSiO4:Bi^3+ceramics were investigated.The BaMgSiO4:Bi^3+ceramics showed reversible photochromism from gray to pink upon alternating the 254 nm ultraviolet light and 532 nm laser irradiation.This is caused by the electron trapping and de-trapping in the oxygen vacancies of the BaMgSiO4:Bi^3+host.This reversible behavior of photochromism was applied to fabricate different patterns on the surface of the BaMgSiO4:Bi^3+ceramics,which exhibited the reversible dual-mode optical information recording and erasing abilities.The photoluminescence reversible modulation of the BaMgSiO4:Bi^3+ceramics was obtained through the photochromic phenomenon.This modification behavior of luminescence could be applied to read-out the recording information in the BaMgSiO4:Bi^3+ceramics.The coloration and bleaching of BaMgSiO4:Bi^3+ceramics were dependent on the time of light stimulation,which facilitated multiplexing encoding.This photoluminescence and photochromism multiplexing of the BaMgSiO4:Bi^3+ceramics enhanced the optical data storage capability.展开更多
The luminescence of EU^2＋ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from dif...The luminescence of EU^2＋ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from different Eu^2＋ sites in the lattice. When the BaB2O4 flux was applied, the intensity of the 398 nm emission was not clearly affected, but the intensity of the 515 nm emission was enhanced by about ten times. Gaussian fitting showed that the emission band at around 515 nm could actually be resolved into two bands with peak wavelengths of 499 nm and 521 nm, respectively. The assignments of the emission bands to the cation sites were carried out according to the values of bond valence. The overlapping of the 398 nm emission band on the excitation band of 515 nm emission implied that energy transfer could occur from the luminescent center related to the 398 nm emission to the center related to the 515 nm emission, and the energy transfer process remarkably enhanced the intensity of the 515 nm emission band. The phosphor had strong excitation at around 350-400 nm and emitted a bright green luminescence. Thus it could have applications as a green component in solid-state lighting devices assembled by near-UV Light Emitting Diodes （LED） combined with tricolor phosphors.展开更多
基金supported by the National Natural Science Foundation of China (51762029, 11674137)the Applied Basic Research Key Program of Yunnan Province (2018FA026)
文摘Optical data storage technology has many advantages over the traditional solid-state and magnetic storage technology,such as low cost,multi-dimensional storage,and rewritable capability.Therefore,the optical data storage technology has been in increasing demand for optical storage media.Herein,the photochromic and photoluminescence properties of BaMgSiO4:Bi^3+ceramics were investigated.The BaMgSiO4:Bi^3+ceramics showed reversible photochromism from gray to pink upon alternating the 254 nm ultraviolet light and 532 nm laser irradiation.This is caused by the electron trapping and de-trapping in the oxygen vacancies of the BaMgSiO4:Bi^3+host.This reversible behavior of photochromism was applied to fabricate different patterns on the surface of the BaMgSiO4:Bi^3+ceramics,which exhibited the reversible dual-mode optical information recording and erasing abilities.The photoluminescence reversible modulation of the BaMgSiO4:Bi^3+ceramics was obtained through the photochromic phenomenon.This modification behavior of luminescence could be applied to read-out the recording information in the BaMgSiO4:Bi^3+ceramics.The coloration and bleaching of BaMgSiO4:Bi^3+ceramics were dependent on the time of light stimulation,which facilitated multiplexing encoding.This photoluminescence and photochromism multiplexing of the BaMgSiO4:Bi^3+ceramics enhanced the optical data storage capability.
基金Project supported by the State Key Program for Basic Research of China (G1998061306)the National Natural Science Foundation of China (20071003, 20221101)the High Tech. Research of Zhejiang Province (2003C31029)
文摘The luminescence of EU^2＋ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from different Eu^2＋ sites in the lattice. When the BaB2O4 flux was applied, the intensity of the 398 nm emission was not clearly affected, but the intensity of the 515 nm emission was enhanced by about ten times. Gaussian fitting showed that the emission band at around 515 nm could actually be resolved into two bands with peak wavelengths of 499 nm and 521 nm, respectively. The assignments of the emission bands to the cation sites were carried out according to the values of bond valence. The overlapping of the 398 nm emission band on the excitation band of 515 nm emission implied that energy transfer could occur from the luminescent center related to the 398 nm emission to the center related to the 515 nm emission, and the energy transfer process remarkably enhanced the intensity of the 515 nm emission band. The phosphor had strong excitation at around 350-400 nm and emitted a bright green luminescence. Thus it could have applications as a green component in solid-state lighting devices assembled by near-UV Light Emitting Diodes （LED） combined with tricolor phosphors.
