TỔNG HỢP VÀ NGHIÊN CỨU TÍNH CHẤT CỦA VẬT LIỆU NANO PHÁT QUANG GdVO4:5%Eu3+ ĐỊNH HƯỚNG ỨNG DỤNG MỰC HUỲNH QUANG BẢO MẬT

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Tác giả: Thị Thảo Lê, Khắc Không Minh Ngô, Quốc Luân Ngô, Thị Thu Hương Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Cần Thơ, 2024

Mô tả vật lý: tr.23

Bộ sưu tập: Metadata

ID: 286683

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The luminescent nanomaterial GdVO4 was synthesized via a combustion method. The structure and morphology of the synthesized material were studied using XRD, SEM, and EDX methods. The optical properties of the material were recorded by fluorescence spectroscopy and fluorescence lifetime measurement. Under excitation light with a wavelength of 254 nm, the fluorescence spectrum showed the characteristic transitions of Eu3+ ions 5D0→7FJ (J = 1,2,3,4), in which the red emission corresponding to the transition 5D0→7F2 at 615 nm was dominant. The fluorescence lifetime of the material was determined to be 1.34 ms. There was an initial successful signal when testing security ink with a composition of GdVO4:5%Eu, PVA, and ethanol. The security ink fluoresced red under excitation light with a wavelength of 254 nm.Vật liệu nano phát quang GdVO4 được tổng hợp bằng phản ứng nổ. Vật liệu sau khi tổng hợp được nghiên cứu cấu trúc, hình thái bằng các phương pháp XRD, SEM, EDX. Tính chất quang của vật liệu được khảo sát bằng phương pháp phổ huỳnh quang và phép đo thời gian sống huỳnh quang. Dưới ánh sáng kích thích có bước sóng 254 nm, phổ huỳnh quang thể hiện các chuyển dời đặc trưng của ion Eu3+ 5D0→7FJ (J = 1,2,3,4), trong đó phát xạ đỏ ứng với chuyển dời 5D0→7F2 ở 615 nm chiếm ưu thế. Thời gian sống huỳnh quang của vật liệu được xác định là 1,34 ms. Bước đầu đã có tín hiệu thành công khi thử nghiệm mực in bảo mật với thành phần gồm GdVO4:5%Eu, PVA và ethanol. Mực bảo mật phát quang đỏ dưới ánh sáng kích thích có bước sóng 254 nm.

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