【摘要】 采用高温固相法在1 500℃保温4h的条件下合成了CaAl₁₂O₁₉∶Mn⁴⁺红色发光材料。通过发光性能测试表征了Mn4+浓度、Na+、Li+、K+以及Mg2+等掺杂离子对材料发光性能的影响。研究发现,在紫外和蓝色波段均可有效激发CaAl₁₂O₁₉∶Mn⁴⁺,其发射主峰位于652nm的深红色光波段,其两侧的肩峰（640、666nm）可归属为声子副带发射。研究结果表明,Mn4+的最佳掺杂浓度为0.05 mol%;共掺的Na+、Li+、Mg2+、K+均可有效提高CaAl₁₂O₁₉∶Mn⁴⁺的发光强度,其中Na+和Li+的最佳掺杂浓度均为5mol%时的发光强度可被提高2倍以上。因此,CaAl₁₂O₁₉∶Mn⁴⁺是一种潜在的可用于提高LED显色性的红色发光材料。更多还原

【Abstract】 A promising candidate red fluorescence CaAl₁₂O₁₉∶Mn⁴⁺was developed,which was prepared by the solidstate reaction method at 1 500 ℃for 4h.The influence of Mn4+concentration and the co-doped ions,R（R=Na+,Li+,K+,and Mg2+）ions on the luminescent properties of CaAl₁₂O₁₉∶Mn⁴⁺were investigated,respectively.The results indicated that the phosphor was able to be excited by both UV and blue band light.The emission band of CaAl₁₂O₁₉∶Mn⁴⁺was in the deep-red region with the maximum at 652 nm,the shoulders on both sides of the peak（640,666nm）were attributed to the phonon sideband transition.It was observed that optimal concentration of Mn4+in CaAl12O19 was 0.05mol%.The co-doped Na+,Li+,Mg2+and K+could dramatically improve the luminous performance of CaAl₁₂O₁₉∶Mn⁴⁺.When the concentration of Na+and Mg2+was 5mol%,the maximum emission intensity of CaAl₁₂O₁₉∶Mn⁴⁺could be increased by more than 2times.So CaAl₁₂O₁₉∶Mn⁴⁺,Na+was expected to be a potential candidate as a red phosphor in warm white LEDs.更多还原