Preparation And Properties Of Metal Ion-doped Zinc Germanate Afterglow Materials

Long afterglow luminescent materials synthesized with rare earth materials as activators have the advantages of good afterglow performance and stable physical energy performance.Although the long afterglow materials synthesized by the traditional high-temperature solid-phase method have good luminous intensity,the products synthesized by this method have a large particle size and uneven distribution.In this paper,Zn₂GeO₄ is used as the host material,and the preparation and performance of Zn₂GeO₄:Eu²⁺are systematically studied by hydrothermal method,in order to synthesize long-lasting luminescent materials with smaller particle size and more uniform particle size distribution.The main contents and conclusions of this paper are as follows:(1)Designed and prepared Zn₂GeO₄:Eu²⁺long afterglow luminescent material.Through experimental research,the optimal ratio of Zn:Ge:Eu=2:1:0.005 in a 30 m L liquid system was determined,and then the optimal ratio was determined at pH=7.5,reaction temperature of 220?,and reaction time of 4 h The reaction conditions,the structure characterization and performance test of Zn₂GeO₄:Eu²⁺synthesized under different doping ratios and different reaction conditions were carried out.The Zn₂GeO₄:Eu²⁺long afterglow luminescent material with controllable afterglow time and adjustable particle size within a certain range was obtained.(2)Designed and prepared Zn₂GeO₄:Re(Re=Dy³⁺,Mn²⁺,Mo⁶⁺)long afterglow luminescent material,and carried out performance tests on it respectively,and explored the synthesis of Zn₂GeO₄:Re(Re=Dy³⁺,Mn²⁺,Mo⁶⁺)the afterglow performance of long afterglow luminescent materials.It is found that Zn₂GeO₄:Mn²⁺,a long-lasting luminescent material synthesized by doping Mn²⁺ions,has strong fluorescence performance and can emit bright green fluorescence when excited by ultraviolet light.After the excitation light is removed,Zn₂GeO₄:Mn²⁺,Zn₂GeO₄:Dy³⁺,Zn₂GeO₄:Mo⁶⁺Both show strong afterglow performance,and the continuous light-emitting time exceeds 200 s.And by simply adjusting the(pH)of the reaction system,a long afterglow luminescent material whose afterglow time can be adjusted within a certain range can be prepared.