【摘要】 用高温固相法合成了红色荧光粉Ca4(La1-x-yGdxYy)1-nO(BO3)3∶nEu3+(LnCOB∶Eu,Ln=La1-x-y-GdxYy),并对其在真空紫外至可见范围的发光性质进行了系统的研究,找出发光较好的组分范围并与某些商品红色荧光粉进行了比较。LnCOB∶Eu在254 nm紫外线激发下的发射光谱为Eu3+的5D0→7FJ(J=0,1,2,3,4)的特征跃迁。监测其最强的5D0→7F2发射线,其激发光谱在250 nm左右有一个宽的激发带,归属于Eu-O电荷迁移带,适于用254 nm汞线激发;在300~450 nm有一些弱的归属于Eu3+的f-f跃迁的锐吸收峰;在真空紫外区184~188 nm附近有一个宽带,为基质吸收带,并可能包含了Eu3+的f-d跃迁。在Ca4GdO-(BO3)3∶Eu3+的激发光谱中,还包含了Gd3+的8S7/2→6GJ跃迁,此跃迁增强了荧光粉在184~188 nm附近的激发强度。更多还原

【Abstract】 Red phosphor Ca₄(La_1-x-yGd_xY_y)_1-nO（BO₃）₃∶nEu³⁺ (LnCOB∶Eu, Ln= La_1-x-yGd_xY_y) was （synthesized） with the method of solid-state reaction at high temperature. The luminescent properties were investigated from vacuum ultraviolet (VUV, E>50 000 cm^-1, λ<200 nm) to visible region. The component with best luminescence intensity was found out and compare with commercial red phosphor. This system shows effective red emission under the excitation of low-pressure mercury lamp. The emission spectra of LnCOB∶Eu³⁺ show the characteristic ⁵D₀→⁷F_J（J=0, 1, 2, 3, 4） transition of Eu³⁺ ions under the excitation of 254 nm. Monitored the strongest ⁵D₀→⁷F₂ emission line （610 nm）, they all have a broad and strong excitation band which centered at about 246 nm which is ascribed to the charge transfer band （CTB） of Eu³⁺-O^2- and result in that the phosphor can be excitated efficiently by low-pressure mercury lamp. In the VUV range, there is a broad host absorption band located around 184¹88 nm in the range from 150²00 nm, which include the （f-d） transition of Eu³⁺. And for Ca₄GdO（BO₃）₃∶Eu³⁺, this broad band is very stronger than that in another two hosts, which should be due to the existence of Gd³⁺ ions and the excitation efficiency can be enhanced （around） 184¹88 nm effectively.更多还原