Study On The Synthetic Technology Of The Strontium Aluminate Luminescent Materials Doped With Rare Earth

This paper explores the synthesis of the rare-earth-doped strontium aluminate luminescent materials,and the conditions are summarized. The main conclusions of the experiment are as follows:1-The experiment uses the high-temperature solid-phase method to synthesize rare-earth-doped strontium aluminate luminescent powders (Sr4Al14O25:Eu2+,Dy3+).The experiment explores the impacts of the synthesis temperature, reaction time, the amounts of H3BO3, the amounts of Eu, the amounts of Dy on the luminescent properties of the luminescent powders.The experiment uses XRD to characterize the crystal structures of luminescent materials, and analyze the impacts of various factors on the crystal structures of the luminescent materials. Determining the synthesis process conditions of the blue-green luminescent materials (Sr4Al14025:Eu2+,Dy3+), optimum synthesis conditions are as follows:(1) The calcined temperature is900℃. When the temperature is900℃, the experiment gets the single crystalline phases of Sr4Al14025,and the luminescent materials have good luminescent properties. The best calcined time is3.5h.(2) H3BO3content of10%is the optimum concentration. When the amount of H3BO3is10%, the materials have better luminescent properties. When the amount of H3BO3is excess, the impurity phases of strontium borate are formed, affecting luminescent properties.(3) When the doping amount of Eu2O3is2%and the doping amount of Dy2O3is1%, the products have better luminescent properties. The amounts of EU2O3and Dy2O3are limited, excessive amounts leading to concentration quenching phenomenon.The experiment explores the synthetic process for preparing the best blue-green luminescent materials (Sr4Al14O25:Eu2+, Dy3+),and uses SEM, XRD, excitation and emission spectras to analyze luminescent properties of the products.2. The experiment uses the high-temperature solid-phase method to synthesize rare-earth-doped strontium aluminate luminescent powders (Sr3Al2O6:Eu2+,Dy3+),and explores the impacts of the synthesis temperature, reaction time, the amounts of H3BO3, the amounts of Eu, the amounts of Dy, other ions on the luminescent properties of the luminescent powders.The experiment uses XRD to characterize the crystal structures of luminescent materials, and analyzes the impacts of various factors on the crystal structures of the luminescent materials. Determining the synthesis process conditions of the red luminescent materials (Sr3Al2O6:Eu2+,Dy3+), optimum synthesis conditions are as follows:(1)The calcined temperature is900℃. When the temperature is900℃,the experiment gets the single crystalline phases of Sr3Al2O6. The luminescent materials have good luminescent properties. The best calcined time is3.5h.(2) H3BO3content of0.35is the optimum concentration. When the amount of H3BO3is0.35, the materials have better luminescent properties. When the amount of H3BO3is excess,the impurity phases of strontium borate are formed, affecting luminescent properties.(3) When the doping amount of Eu2O3is0.08and the doping amount of Dy2O3is0.06, the products have better luminescent properties. The amounts of Eu2O3and Dy2O3are limited, excessive amounts leading to concentration quenching phenomenon. Mg2+and S can enhance the luminescence of the luminescent materials.The experiment explores the synthetic process for preparing the best red luminescent materials (Sr3Al2O6:Eu2+, Dy3+),and uses SEM, XRD, excitation and emission spectras to analyze luminescent properties of the products.