新型红色荧光粉KMgLa(PO_4)_2∶Eu^(3+)的发光特性（英文）

Luminescence Properties of Novel Red Phosphor KMgLa(PO_4)_2∶Eu^(3+)

采用高温固相法制备了Eu^(3+)掺杂的KMgLa(PO_4)_2荧光粉。采用X射线衍射技术及光谱技术研究了材料的晶相及发光特性。研究结果显示,少量的Eu^(3+)并未影响KMgLa(PO_4)_2的晶相;以260 nm紫外光或394 nm近紫外光作为激发源时,KMgLa(PO_4)_2∶Eu^(3+)都发射红色光,主发射峰位于595 nm,对应Eu^(3+)的~5D_0→~7F_2跃迁发射;随着Eu^(3+)掺杂量的逐渐增大,对应KMgLa(PO_4)_2∶Eu^(3+)材料的发射强度随之增大,当掺杂量为0.06Eu^(3+)时,发射强度最大,且存在浓度猝灭现象,对应的临界距离为1.696 nm;材料的CIE参数显示,材料位于红色区域。

A series of Eu^3 ＋ doped KMgLa （ PO4 ） 2 were prepared via a high-temperature solid-state method. The phase present of phosphor was characterized by a powder X-ray diffraction（ XRD） , and the spectra of phosphors were measured by the fluorescence spectrophotometer. Under the 260 nm or 394 nm excitation,KMgLa （ PO4 ）2 ： Eu^3 ＋ presents an obvious red emission, and the strongest emission peak locates at 595 nm, which is ascribed to the ^5D0 →^7F2 transition of Eu^3＋. The emission intensity of phosphors can be tuned by changing the Eu3＋ concentration, and the optimal Eu^3＋ doping concentration is 0. 06,and there is the concentration quenching effect of Eu^3＋ in KMgLa （ PO4 ）2,and the critical distance is 1.696 nm. Its CIE chromaticity coordinates located in the red region.