助熔剂及基质改性对光学测温材料Y3Al5O12:Dy3+性能的影响OA

Herein,Y3Al5O12:Dy3+was synthesized by high-temperature solid-state method after adding different fluxes(such as H3BO3,fluoride,chloride,carbonate,etc.)and adjusting matrix ions(partial substitution of Y3+or Al3+with Lu3+,Ca2+,Zr4+,Si4+,etc.).The structure,morphology,photoluminescence properties and temperature measurement properties of the synthesized phosphors were systematically investigated.In terms of flux optimization,the addition of 2％(mass percent)H3BO3 was observed to enhance the crystallinity and improve the luminescent intensity of the phosphors.Regarding host ion regulation,among all modified samples,Lu2Y0.96Al5O12:0.04Dy3+,where Y3+was partially substituted with Lu3+,exhibited the strongest luminescence.Under 353 nm ultraviolet excitation,as the temperature increased from 298 K to 1073 K,the intensity of the 483 nm emission peak(4F9/2→6H15/2)decreased while that of the 456 nm peak(4I15/2→6H15/2)increased.Utilizing the fluorescence intensity ratio(FIR)of these two thermally coupled energy level transitions enabled optical temperature measurement over a wide temperature range.Specifically,the maximum relative sensitivities of Y3Al5O12:Dy3+phosphor with 2％H3BO3 added and Lu2Y0.96Al5O12:0.04Dy3+phosphor with matrix ion substitution reached 0.7317％/K(at 378 K)and 0.7483％/K(at 398 K),respectively,and their maximum absolute sensitivities were 0.00086 K-1(at 918 K)and 0.00085 K-1(at 958 K),respectively.Due to the influence of temperature change,the electrons on the thermal coupling energy level are redistributed,and the emission lifetime of Lu2Y0.96Al5O12:0.04Dy3+phosphor at 483 nm is shortened from 0.405 ms at 298 K to 0.314 ms at 1073 K.These results provide experimental basis and optimization strategies for the design and improvement of high-sensitivity optical temperature sensors with wide temperature ranges.