CAJ | 학술논문

采用高温固相法合成了Ca_3B_2O_6:Eu~(3+)红色荧光粉,并对其发光性质进行了研究.样品的激发光谱由位于220～350 nm的带状谱和350～500 nm的一系列窄带组成,这些窄带是由Eu~(3+)的f-f跃迁引起的,光谱峰值分别为280,396和469 nm.它可以被近紫外光辐射二极管管芯产生的350～410 nm辐射有效激发.用396 nm激发得到样品的发射光谱,峰值位于578,590,610,618和650 nm,分别由Eu~(3+)离子的~5D_4→~7F_J(J=0,1,2,3)跃迁引起的. 研究了Eu~(3+)离子浓度和电荷补偿剂对发射光谱的影响.结果显示随着Eu~(3+)浓度增加,发光强度逐渐增强,未发现浓度猝灭现象.掺入Li~+,Na~+,K~+3种离子作为电荷补偿剂,均提高了样品的发光强度,其强度从大到小依次为I(Li~+)>I(Na~+)>I(K~+),说明Li~+是最佳的电荷补偿剂.
채용고온고상법합성료Ca_3B_2O_6:Eu~(3+)홍색형광분,병대기발광성질진행료연구.양품적격발광보유위우220～350 nm적대상보화350～500 nm적일계렬착대조성,저사착대시유Eu~(3+)적f-f약천인기적,광보봉치분별위280,396화469 nm.타가이피근자외광복사이겁관관심산생적350～410 nm복사유효격발.용396 nm격발득도양품적발사광보,봉치위우578,590,610,618화650 nm,분별유Eu~(3+)리자적~5D_4→~7F_J(J=0,1,2,3)약천인기적. 연구료Eu~(3+)리자농도화전하보상제대발사광보적영향.결과현시수착Eu~(3+)농도증가,발광강도축점증강,미발현농도졸멸현상.참입Li~+,Na~+,K~+3충리자작위전하보상제,균제고료양품적발광강도,기강도종대도소의차위I(Li~+)>I(Na~+)>I(K~+),설명Li~+시최가적전하보상제.
Ca_3B_2O_6:Eu~(3+) red phosphor was synthesized by high temperature solid state reaction and its luminescent properties were investigated. XRD analysis indicated the pure Ca_3B_2O_6:Eu~(3+) crystallite was obtained at 1 100 ℃ for 2 h. Excitation spectrum consists of wide band located at 220 to 350 nm and a series of narrow bands located at 350 to 500 nm which are attributed to f-f transitions of Eu~(3+) ion. The peaks of excitation spectra are 280, 396 and 469 nm, respectively. This phosphor can be excited effectively by near-ultraviolet light-emitting diodes (UVLED). The peaks of emitting spectra are 578,590,610,618 and 650 nm, corresponding to ~5D_4→~7F_J(J=0,1,2,3)typical transitions of Eu~(3+), respectively. The effects of charge compensations and the molar concentration of Eu~(3+) on the emission intensity were also studied. The intensity of Ca_3B_2O_6:Eu~(3+) was improved obviously with the increasing concentration of Eu~(3+), but the concentration quench did not observed. The role of charge compensations of Li~+, Na~+ and K~+ ions can all increased the luminescent intensity of Ca_3B_2O_6:Eu~(3+). Li~+ ion gave the best improvement to enhance the intensity of the emission obviously. Li~+ ion is the optimal charge compensation.