Synthesis And Upconversion Luminescent Properties Of Fluoride And Oxyfluoride Upconversion Materials

Upconversion luminescence materials are widely used in laser technology, security, optical information storage, display, biological marker and medicine due their converting property of infrared light into visible light. In this paper, BaMgF4:Yb+and Er+nanocrystalline were synthesized by reverse co-precipitation method. Rich level of Er3+ions with high absorption of the infrared wavelength were used as activator, and Yb3+used as sensitizer. For producing the converted materials, YOF:Yb3+, Er3+and GdOF:Yb3+, Er3+were used with high temperature solid-state method. After that, the luminescence properties and transformation mechanism of converted materials were studied.The BaMgF4:Yb3+, Er3+Nanocrystalline also was prepared by reverse co-precipitation method. XRD and SEM analysis showed this material hasorthogonal structure and rod-shaped morphology. Convertion spectra are mainly composed of red (650-666nm) and green (521nm,539-547nm) wavelength which can be attributed to the energy transition of Er3+ions4I9/2â†'4I15/2,2H1/2â†'4I1/5,I15/2,4S3/2â†'4I15/2.When the doping concentration of Er3+ions is3%and Yb3+ion is10%, BaMgF4:Yb3+,Er3+have the maximum Upconversion luminescence efficiency. When the Yb3+doping concentration is less than15%, the green emission is the main spectra. If the Yb3+concentration exceeds15%, the red emission is main. The Upconversion fitting curve between the luminous intensity and pump current relationship indicated that the Upconversion process on the green and red light of BaMgF4:Er3+, Yb3+were due to two-photon absorption.2. YOF:Yb3+, Er3+was prepared by high temperature solid-state method. XRD analysis showed that YOF:Yb3+, Er3+Upconversion luminescence material has tripartite structure, the emission of the sample is visible red (654-670nm) and green light (517nm,534-555nm) under the980nm infrared light excitation wavelength, and the Upconversion luminescence processes are contained two-photon absorption. When the doping concentration of Er3+ions is5%and Yb3+ions is10%, YOF:Yb3+,Er3+have the maximum Upconversion luminescence efficiency. Comparing the influence of fluoride matrix YF3and fluoride oxide matrix YOF to the Upconversion luminescence intensity, we found that under the980nm infrared light excitation wavelength, Upconversion emission intensity of two samples are almost the same, but the stability and preparation conditions of YOF:Yb3+, Er3+were better than YF3:Yb3+, Er3+3. GdOF:Yb3+, Er3+was prepared by high temperature solid-state method. XRD analysis showed that GdOF:Yb3+, Er3+Upconversion luminescence material has tripartite structure. Through Upconversion spectra, it can be seen that the spectrum is primarily composed of red (650-666nm) and green (521nm,539-547nm) and the Upconversion process are contained two photon absorption. For the Upconversion luminescence material GdOF, the best doped ratio for Er3+and Yb3+is that Er3+ions is5%and Yb3+ions is10%.