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作 者:李盼来[1] 王志军[1] 王颖[1] 杨志平[1] 郭庆林[1] 李旭[1] 杨艳民[1] 傅广生[1]
机构地区:[1]河北大学物理科学与技术学院,保定071002
出 处:《物理学报》2009年第8期5831-5835,共5页Acta Physica Sinica
基 金:河北省自然科学基金(批准号:E2009000209)资助的课题~~
摘 要:采用固相法制备了LiBaBO3:Ce3+发光材料.测得LiBaBO3:Ce3+材料的发射光谱为一不对称的单峰宽谱,主峰位于440nm;监测440nm发射峰,可得其激发光谱为一主峰位于370nm的宽谱.利用vanUitert公式计算了Ce3+取代LiBaBO3中Ba2+时所占晶体学格位,得出438nm发射带归属于九配位的Ce3+发射,而469nm发射带起源于八配位的Ce3+发射.研究了Ce3+浓度对LiBaBO3:Ce3+材料发光强度的影响,结果显示,随Ce3+浓度的增大,发光强度呈现先增大后减小的趋势,Ce3+浓度为3mol%时强度最大,造成其浓度猝灭的原因为电偶极-偶极相互作用.引入Li+,Na+或K+可增强LiBaBO3:Ce3+材料的发射强度.利用InGaN管芯(370nm)激发LiBaBO3:Ce3+材料,获得了很好的蓝白光发射,色坐标为(x=0.291,y=0.297).LiBaBO3:Ce^3+ phosphor was prepared by solid-state method, and its luminescence characteristics were investigated. LiBaBO3 : Ce3 + phosphor shows one asymmetrical band at 440 nm. Monitored at 440 nm, the excitation spectrum has a broad band at 370 nm. The crystallographic sites of Ce3 + in LiBaBO3 were calculated by van Uitert formula, the results show that the emission band centered at 438 nm originates from the Ce3+ center of the nine compounds, and at 469 nm originates from the Ce3+ center of the eight compounds. The effect of Ce3+ concentration on luminescent intensity of LiBaBO3: Ce3+ phosphor was investigated, the result shows that the luminescent intensity firstly increases with increasing Ce3 + concentration, and reaches the maximal value at 3mol% Ce3+ , then decreases. The concentration quenching mechanism is the dipole-dipole interaction by Dexter theory. Under the condition of doping charge compensator Li + , Na+ or K+ , the emission intensity of LiBaBO3 : Ce3+ was all heightened. The relative emission spectrum of the InGaN-based LiBaBO3 :Ce3+ light emitting diode(LED) was investigated, and the CIE chromaticity of InGaN-based LiBaBO3 :Ce3+ LED is (x = 0.291, y = 0.297),and shows the blue white emission.
关 键 词:白光发光二极管 LiBaBO3:Ce^3+ 晶体学格位 发光特性
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