TỔNG HỢP COMPOSITE HUỲNH QUANG PMMA BẰNG PHƯƠNG PHÁP THIÊU NHIỆT SỬ DỤNG CITRIC ACID VÀ ETHYLENEDIAMINE

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Tác giả: Giữ Quốc Hà, Thị Lam Hà, Xuân Dũng Mai, Đức Anh Nguyễn, Phương Nam Nguyễn, Sinh Hùng Nguyễn, Thị Lan Anh Nguyễn, Thu Huyền Nguyễn, Thị Kiều Phạm, Thị Thanh Thanh Phạm, Thị Thùy Trang Phạm, Đại Luật Trần

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2022

Mô tả vật lý: tr.62 - 67

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ID: 335580

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Composite huỳnh quang không ưa nước, bền với không khí có tiềm năng ứng dụng trong lĩnh vực chuyển đổi quang học ngoài trời. Trộn chất nền polymer với bột huỳnh quang là phương pháp phổ biến được sử dụng để chế tạo composite huỳnh quang, tuy nhiên composite thu được thường có các khối kết tụ của chất huỳnh quang làm giảm khả năng phát xạ của nó. Trong nghiên cứu này, chúng tôi trình bày phương pháp chế tạo composite huỳnh quang bằng cách thiêu nhiệt hỗn hợp PMMA, citric acid và ethylenediamine ở nhiệt độ dưới 200oC. Các phương pháp phổ hấp thụ UV-Vis và phổ phát xạ huỳnh quang được sử dụng để nghiên cứu tính chất quang của composite. Compsite có peak hấp thụ đặc trưng ở ~346 nm, phổ phát xạ dạng đám với cực đại phát xạ ở ~460 nm và một cực đại kích thích phát xạ ở khoảng 370 nm. Sự tương đồng trong tính chất hấp thụ và phát xạ giữa composite và mẫu đối sánh tổng hợp bằng phương pháp thủy nhiệt hỗn hợp citric acid và ethylenediamine cho thấy tính chất quang của composite do chất quang hoạt IPCA hình thành và phân tán đồng nhất trong nền PMMA.Water resistant, air-stable and luminescent composites have a great potential for outdoor light-conversion applications. Mixing luminescent materials and polymers is a convenient method for the preparation of composites but it is requited by luminescence quenching induced by the aggregation of the luminescent component. Herein, we have demonstrated the preparation of luminescent composite by simple thermal annealing a mixture of PMMA, citric acid, and ethylenediamine at temperatures below 200oC. UV-Vis absorption and photoluminescent spectroscopies were employed to study the optical properties of the luminescent composites. The resultant composite exhibits a characteristic absorption peak at 346 nm, a broad emission spectrum maximizing at 460 nm and an excitation peak at about 370 nm. The similarity in the absorption and emission properties between the composite and a reference sample prepared by hydrothermal treatment a mixture of citric acid and ethylene diamine indicates that IPCA fluorophore formed homogeneously in PMMA accounts for the optical properties of the composite.

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