Double-active Center Luminescent Phosphor And Laser Wavelength Detection Performance

Luminescent phosphors have been widely reported because of their practical value,and their application fields cover a very wide range,such as laser,display,lighting,indoor plant cultivation,medical detection,etc.Different combinations of substrates and activator ions in phosphors have different luminescence properties,which makes it possible to rationally combine various substrates and activator ions to achieve luminescence with different properties.In recent years,people have been exploring the approaches and schemes of solid luminescent materials used in sensing and detection technology,and one of the most reported technologies is the application of fluorescence in temperature sensing.Laser wavelength measurement is very important to astronomy,military,information science,metrology and other fields.The performance of wavelength detection is developing toward miniaturization,intelligence,high stability and high precision,and it is still people’s unremitting pursuit to explore new wavelength detection technology.In this paper,we will explore the luminescence properties of the fluorescents with double activation centers in two phosphors,and try to use the corresponding relationship between the luminescence intensity ratio of the two activation centers of the fluorescents and the excitation wavelength to realize the detection of laser wavelength.The following work has been specifically carried out:（1）Eu³⁺and Cr³⁺single-doped and co-doped La Mg Ga₁₁O₁₉phosphors were prepared and the luminescence characteristics were analyzed.La Mg Ga₁₁O₁₉:Eu³⁺phosphor excitation band extends from 250 nm to 500 nm and ranges from ultraviolet light to visible light.The emission band ranges from 530 nm to 710 nm,and the emission line is sharp.The excitation spectrum of La Mg Ga₁₁O₁₉:Cr³⁺extends from200 nm to 500 nm and a wide emission band with peak value at 710 nm can be observed under 450 nm excitation.The emission characteristics of Eu³⁺and Cr³⁺can be observed by doping two activator ions in La Mg Ga₁₁O₁₉matrix at the appropriate laser wavelength excitation.The fluorescence intensity ratio of the two activation centers under continuous wavelength excitation was calculated.The results show that the fluorescence intensity ratio and wavelength have monotonic corresponding relationship in the band range of 280 nm-320 nm and 390 nm-408 nm.This indicates that the value of the excitation wavelength can be determined in turn by calculating the fluorescence intensity ratio of the activation center.It can be seen that this material has the function of laser wavelength detection in the range of 280 nm-320 nm and 390 nm-408 nm.（2）Cr³⁺and Mn⁴⁺doped BaMgAl₁₀O₁₇double-activated center luminescence phosphors were prepared.BaMgAl₁₀O₁₇:Cr³⁺excitation band ranges from 200 nm to600 nm,with three obvious excitation peaks,and the strong excitation peak falls at396 nm.The emission spectrum ranges from 630 nm to 800 nm.The excitation spectrum of BaMgAl₁₀O₁₇:Mn⁴⁺phosphors ranges from 250 nm to 600 nm,and the excitation peaks at 311 nm and 468 nm are more obvious.The emission spectrum extends from 600 nm to 800 nm.BMA:0.008Mn⁴⁺/0.003Cr³⁺phosphors were continuously excited in the band range of 320 nm-400 nm,400 nm-470 nm and 480nm-530 nm,and the results show that the fluorescence intensity ratio of I(Cr³⁺)/I(Mn⁴⁺)is corresponding to the excitation wavelength.The BMA:0.008Mn⁴⁺/0.003Cr³⁺double center phosphors can realize laser excitation wavelength detection in the long wavelength range of 320 nm-530 nm.The temperature-emission spectra of phosphors are measured,which shows that the wavelength measurement needs to be carried out at a relatively stable temperature.