Research On Dual-luminescence Center Phosphor For Laser Wavelength Detection

Luminescent materials have received much attention since its appearance.There are also numerous reports on the application of luminescent materials.Luminescent materials show different performance when they are prepared with different host materials and active ions.Nowadays,luminescent materials are used in many fields,such as anti-counterfeiting,agricultural production and displays.Luminescent materials are also used for temperature sensing and pressure sensing.The sensing methods which used luminescent materials show a lot of advantages,such as anti-electromagnetic interference,non-contact measurement,etc.The wavelength of laser plays an important role in the application of laser.In order to research a new method which uses luminescent materials to measure the laser wavelength,the following work have been done in this paper:?1?Cr³⁺doped and Mn⁴⁺/Cr³⁺co-doped La₂Zn Ti O₆ phosphors were synthesized by solid-state reaction method at high temperature and their luminescence performance has been investigated.Cr³⁺doped La₂Zn Ti O₆ phosphor exhibits red luminescence band when excited with light in spectral range from ultraviolet to blue.The optimal doping concentration of Cr³⁺is determined to be 0.7 mol%.In the co-doped samples,the excitation spectra of Mn⁴⁺and Cr³⁺overlap in a wide range,and the emission bands of Mn⁴⁺at 710 nm and that of Cr³⁺at 740 nm can be observed in the emission spectrum at the same time.The optimal doping concentrations of Mn⁴⁺and Cr³⁺in co-doped samples are determined to be 0.07 mol%and 0.7 mol%,respectively.The correspondence between the luminescence intensity ratio of Mn⁴⁺/Cr³⁺and the excitation wavelength is determined.The temperature stability of the co-doped phosphor has been discussed.?2?Mn⁴⁺/Eu³⁺co-doped La₂Zn Ti O₆ phosphors were synthesized by solid-state reaction method at high temperature and their luminescence performance has been investigated.In these phosphors,Mn⁴⁺can be excited by the light in the range of 300to 500 nm.The excitation spectrum of Eu³⁺shows several narrow excitation peaks.Both the emission band of Eu³⁺at 614 nm and that of Mn⁴⁺at 670 nm can be observed in the emission spectrum.The optimal doping concentrations of Mn⁴⁺and Eu³⁺in co-doped samples are determined to be 0.3 mol%and 20 mol%,respectively.The correspondence between the luminescence intensity ratio of Mn⁴⁺/Eu³⁺and the excitation wavelength was determined.The temperature stability of the co-doped phosphor has been discussed.