LiMBO3 : Dy3+材料的发光特性

采用固相法制备了LiM(M=Ca, Sr, Ba)BO₃ : Dy³⁺材料,并研究了材料的发光特性。LiM(M=Ca, Sr, Ba)BO₃ : Dy³⁺材料的发射光谱均呈多峰发射,对应于Ca,Sr,Ba,其主发射峰分别是Dy³⁺的⁴F_9/2→⁶H_15/2(484,486,486 nm),⁶H_13/2(577,578,578 nm)和⁶H_11/2(668,668,666 nm)跃迁。监测黄色发射峰时,所得激发光 谱峰值位置相同,主激发峰分别为331,368, 397,433,462,478 nm,对应Dy³⁺的⁶H_15/2→ ⁴D_7/2,⁶P_7/2,⁶M_21/2,⁴G_11/2,⁴I_15/2和⁶F_9/2跃迁。研究了敏化剂Ce³⁺及电荷补偿剂Li⁺、Na⁺和K⁺对LiM(M=Ca, Sr, Ba)BO₃ : Dy³⁺材料发光强度的影响。结果显示:加入敏化剂Ce³⁺提高了材料的发光强度,发光强度最大处对应的Ce³⁺浓度为3%;加入电荷补偿剂Li⁺、Na⁺和K⁺后,材料的发光强度也得到了明显提高,但发光强度最大处对应的Li⁺、Na⁺和K⁺浓度不同,依次为4%、4%和3%。

Luminescent Characteristics of LiM(M=Ca, Sr, Ba)BO3 : Dy3+ Phosphor

LiM(M=Ca,Sr,Ba)BO3 : Dy3+ phosphors were synthesized by solid state reaction, and their luminescet characteristics were investigated. The emission spectra of LiM(M=Ca,Sr,Ba)BO3 : Dy3+ phosphors show several bands, and the main emission peaks corresponding to Ca, Sr and Ba ion are the 4F9/2→6H15/2(484, 486 and 486 nm), 6H13/2(577, 578 and 578 nm) and 6H11/2(668, 668 and 666 nm) typical transitions of Dy3+. The excitation spectra for the yellow emission have the same excitation peaks located at 331, 368, 397, 433, 462 and 478 nm,corresponding to the 6H15/2→4D7/2, 6P7/2, 6M21/2, 4G11/2, 4I15/2 and 6F9/2 transitions of Dy3+. The effects of doping Ce3+or Li+, Na+, K+ on the luminescence intensities of LiM(M=Ca,Sr,Ba)BO3 : Dy3+ phosphors were studied, and the results showed that the intensities of LiM(M=Ca,Sr,Ba)BO3 : Dy3+ phosphors are obviously effected. The intensities increase with increasing Ce3+ concentration and reache the maximum value at 3%. Under the condition of doping Li+, Na+ and K+, the intensities are enhanced, however, the charge compensation concentration corresponding to the maximum emission intensity is different with different charge compensation ions, and the optimal concentrations are 4%, 4% and 3% corresponding to Li+, Na+ and K+, respectively.