【摘要】 采用微波辅助共沉淀法制备Sr(1-x)CO3:xTb3+绿色荧光粉,并利用SEM、XRD、PL-PLE等仪器分别对样品的形貌、物相和发光性能进行表征。结果表明,样品由片状和类球形组成,掺杂Tb3+作为发光中心进入到碳酸锶晶格中。该荧光粉的激发主峰位于231 nm处的4 f7→5d1宽带吸收;发射光谱的最强发射峰位于543 nm处,对应于Tb3+的5D4→7F5跃迁,属于绿色发光。研究Tb3+离子掺量对样品发光性能的影响,随着Tb3+离子掺杂浓度的增大,发光强度先增加后减小,最佳掺杂量x为3.5%。初步探讨Tb3+离子的浓度猝灭机理为交换相互作用。更多还原

【Abstract】 The Tb3+-doped strontium carbonate phosphor was synthesized via co-precipitation route by microwave assisted.The phosphor powders were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD) and photoluminescence and photoluminescence excitation(PL-PLE) spectrum.The results showed that Tb3+ acting as a luminescent center probed into the single orthorhombic phase of SrCO3 with flake-like and sphericity-like.The PLE spectrum showed a broadband absorption center in 231 nm,which belonged to 4f7→5d1 transition.The sample was the green phosphor since the maximum emission peak located in the vicinity of 543 nm,corresponding to the transition of 5D4→7F5.The luminescent intensities increased with increasing Tb3+ concentration,and then decreased because of concentration quenching.The optimal concentration of Tb3+ was 3.5 mol%.The concentration self-quenching mechanism is exchange interaction.更多还原