Tổng hợp và khảo sát tính chất quang của bột huỳnh quang LaAlO₃ đồng pha tạp Mn⁴⁺ và Na⁺
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Abstract
LaAlO₃ phosphors co–doped with Mn⁴⁺ and Na⁺ were synthesized via the co–precipitation method. X–ray diffraction analysis revealed that the crystallinity of the investigated LaAlO₃ materials improved with increasing calcination temperature up to 1.200°C. Photoluminescence spectra showed an emission band at 660–750 nm upon 410 nm excitation, corresponding to the characteristic red emission of Mn⁴⁺ ions. The optimal doping concentration was determined to be 0.3 mol% Mn⁴⁺ and 0.5 mol% Na⁺. The presence of Na⁺ ions in the LaAlO₃ host lattice acted as a charge compensator, contributing to structural stabilization and enhancing the luminescence intensity by 38% compared with the singly doped Mn⁴⁺ sample.
Tóm tắt
Bột huỳnh quang LaAlO3 đồng pha tạp Mn4+ và Na+ được tổng hợp bằng phương pháp đồng kết tủa. Kết quả phân tích nhiễu xạ tia X cho thấy độ kết tinh của vật liệu LaAlO₃ nghiên cứu được cải thiện khi tăng nhiệt độ nung đến 1.200℃. Kết quả phân tích quang phổ huỳnh quang được ghi nhận phổ phát xạ tại bước sóng kích thích là 410 nm ứng với phát xạ đỏ đặc trưng của ion Mn⁴⁺ trong vùng phổ rộng từ 660 nm đến 750 nm. Nồng độ pha tạp tối ưu là 0,3% mol Mn⁴⁺ và 0,5% mol Na+. Sự có mặt của Na⁺ trong mạng nền LaAlO3 đóng vai trò bù điện tích, góp phần ổn định cấu trúc và nâng cao hiệu suất phát quang lên 38% so với đơn pha tạp Mn4+.
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