CAJ | 학술논문

采用高温固相法,以CaCO3(A.R)、BaCO3(A.R)、H3BO3(A.R)和Eu2O3(99.99％)为原料制备了Ba2Ca(BO3)2∶Eu2+绿色发光材料,测量了材料的晶体结构、发光特性及色坐标等.Ba2 Ca(BO3)2∶Eu2+材料的激发光谱覆盖200～500nm的紫外-可见光区.在400nm近紫外光激发下,材料的发射光谱为一主峰位于537nm的非对称宽谱,对应于Eu2+的4f65d1→4f7特征跃迁.研究发现,随Eu2+掺杂浓度的增大,Ba2 Ca(BO3)2∶Eu2+材料的发射强度呈现先增大、后减小的变化趋势,最大发射强度对应的Eu2掺杂摩尔分数为2％.造成发射强度下降的原因为浓度猝灭,其机理为电偶极-电偶极相互作用.依据晶格常数及实验光谱数据,得出临界距离Rc分别为2.64nm和2.11nm.随Eu2+掺杂浓度的增大,Ba2Ca(BO3)2∶Eu2+材料的色坐标变化微小.计算得到Ba2Ca(BO3)2∶2％Eu2+的转换效率约为72％.
채용고온고상법,이CaCO3(A.R)、BaCO3(A.R)、H3BO3(A.R)화Eu2O3(99.99％)위원료제비료Ba2Ca(BO3)2∶Eu2+록색발광재료,측량료재료적정체결구、발광특성급색좌표등.Ba2 Ca(BO3)2∶Eu2+재료적격발광보복개200～500nm적자외-가견광구.재400nm근자외광격발하,재료적발사광보위일주봉위우537nm적비대칭관보,대응우Eu2+적4f65d1→4f7특정약천.연구발현,수Eu2+참잡농도적증대,Ba2 Ca(BO3)2∶Eu2+재료적발사강도정현선증대、후감소적변화추세,최대발사강도대응적Eu2참잡마이분수위2％.조성발사강도하강적원인위농도졸멸,기궤리위전우겁-전우겁상호작용.의거정격상수급실험광보수거,득출림계거리Rc분별위2.64nm화2.11nm.수Eu2+참잡농도적증대,Ba2Ca(BO3)2∶Eu2+재료적색좌표변화미소.계산득도Ba2Ca(BO3)2∶2％Eu2+적전환효솔약위72％.
Ba2 Ca(BO3)2∶Eu2+ phosphor was synthesized by a high temperature solid-state method.CaCO3 (A.R),BaCO3(A.R),H3BO3(A.R) and Eu2O3(99.99％) were used as raw materials.Its crystal structure,luminescent characteristics and Commission International de l'Eclairage (CIE) chromaticity coordinates values were measured.Under the ultraviolet to visible light irradiation,Ba2 Ca( BO3 ) 2 ∶ Eu2 + shows an asymmetrically single green emission band with a maximum at 537 nm,which corresponds to the 4f65d1→4f7 transition of Eu2+.The emission intensity of Ba2Ca(BO3)2∶ Eu2+ was influenced by Eu2+ molefraction,at first,it increases with the increase of Eu2+ mole fraction,and reaches a maximum value at 2％Eu2+,then decreases with further increasing its concentration because of the concentration quenching effect.And the concentration quenching mechanism is verified to be dipole-dipole interaction.According to the crystal structure data and the experimental spectral data,the critical distances( Rc ) can be obtained,and are 2.64 nm and 2.11 nm,respectively.Moreover,with increasing the Eu2+ doped content,the CIE chromaticity coordinates of the samples were slightly varied.For Ba2 Ca( BO3 ) 2∶2％ Eu2 +,the quantum efficiency is approximately 72％.