提高空气中制备Ba_2MgSi_2O_7…Eu^(2+)的发光性能

Enhanced Luminescence Properties of Ba_2MgSi_2O_7…Eu^(2+)Prepared in Air Atmosphere

通过高温固相反应在空气中制备了一系列Eu掺杂的Ba2MgSi2O7发光材料。利用发射光谱和激发光谱,证实在Ba2MgSi2O7中,Eu3+在空气中被还原成Eu2+。研究表明:在1350℃急冷条件下制备Ba2MgSi2O7…Eu2+荧光粉比在1250℃炉冷条件下制备的发光强度提高了近6倍。而且,添加NH4F助溶剂能提高空气中制备Ba2MgSi2O7…Eu2+荧光粉的发光性能。当NH4F用量为4%时(摩尔分数),Ba2MgSi2O7…Eu2+荧光粉的发光强度是不含助溶剂的5倍。

A series of Eu-doped Ba2MgSi2O7 phosphors are prepared in air atmosphere by the high temperature solid-state reactions.A reduction of Eu3＋ to Eu2＋ ion is validated in Ba2MgSi2O7 via emission and excitation spectra measurement.The results show that the photoluminescence（PL） intensity of the Ba2MgSi2O7／：Eu2＋ prepared in air at 1350 ℃ with quench cooling was enhanced about 6 times compared with that of Ba2MgSi2O7／：Eu2＋ prepared in air at 1250 ℃ with furnace cooling.Moreover,the PL intensity of the Ba2MgSi2O7／：Eu2＋ is increased by adding NH4F flux.The PL intensity of Ba2MgSi2O7／：Eu2＋ phosphor containing 4% NH4F（molar fraction） is 5 times as high as that of the Ba2MgSi2O7／：Eu2＋ phosphor without NH4F.