Tổng hợp và tính chất quang của vật liệu huỳnh quang α-Al2O3 pha tạp Mn4+ phát xạ đỏ đậm ứng dụng cho đèn LED chiếu sáng chuyên dụng cây trồng

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Văn Quang Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Việt Nam - B, 2022

Mô tả vật lý: tr.49

Bộ sưu tập: Metadata

ID: 331417

Thêm vào giỏ Liên kết toàn văn

Bột huỳnh quang phát xạ đỏ α-Al2O3:Mn4+ được chế tạo bằng phương pháp đồng kết tủa và thiêu kết ở nhiệt độ 1000-1500oC trong không khí. Ảnh hưởng của nhiệt độ thiêu kết và nồng độ Mn4+ đến tính chất quang của vật liệu được nghiên cứu. Kết quả XRD chỉ ra rằng, cấu trúc tinh thể Al2O3 mạng tinh thể lục giác có cấu trúc không gian R3C. Phổ kích thích tồn tại 2 vùng hấp thụ với 2 bước sóng cực đại tại 399 và 568 nm, được gắn cho sự chuyển dịch năng lượng 4A2g(F)→4T1g(F) và 4A2g(F)→4T2g(F). Dưới bước sóng kích thích 399 và 568 nm, bột huỳnh quang α-Al2O3:0,1% Mn4+ phát ra ánh sáng màu đỏ mạnh ở bước sóng 694 nm do chuyển mức năng lượng 2Eg→4A2g. Một đèn LED đỏ được chế tạo bằng cách phủ bột Al2O3:0,1% Mn4+ lên chíp violet nằm trong vùng ánh sáng đỏ đậm. Từ những kết quả thu được cho thấy, α-Al2O3:Mn4+ có tiềm năng trong sản xuất LEDs phát xạ đỏ chiếu sáng chuyên dụng cho cây trồng.Red-emitting α-Al2O3:Mn4+ fluorescent powders were prepared by co-precipitation method and sintered at 1000 to 1500oC in the air. Effects of sintering temperature and Mn4+ concentration on the optical properties of the materials were investigated. The X-ray diffraction (XRD) showed that the crystallinity of Al2O3 belonged to hexagonal with R3C space group. The excitation spectrum consisted of two broad intense bands centered at 399 and 568 nm and was assigned to 4A2g(F)→4T1g(F) and 4A2g(F)→4T2g(F) transitions, respectively. Under the excitation wavelengths of 399 and 568 nm, the α-Al2O3:0.1% Mn4+ phosphors emitted efficient red light at 694 nm caused by 2Eg→4A2g transition. A red LED is made by coating Al2O3:0.1% Mn4+ powder on a violet chip located in the deep-red light region. These results showed that α-Al2O3:Mn4+ has the potential to produce red LED lightings for plants.

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR