Eu2+‐Doped Layered Double Borate Phosphor with Ultrawide Near‐Infrared Spectral Distribution in Response to Ultraviolet–Blue Light Excitation. Issue 5 (2nd January 2022)

• Record Type: Journal Article
• Authors: Tang, Zuobin; Du, Feng; Liu, Hu; Leng, Zhihua; Sun, Xiaoqin; Xie, Huidong; Que, Meidan; Wang, Yuhua
• Is Part Of: Advanced optical materials. Volume 10:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-02
• Subjects: Ba 3Lu(BO 3) 3:Eu 2+ -- NIR emission -- photoluminescence -- ultrabroadband -- X‐ray diffraction; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202102204
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Ultrabroadband near‐infrared (NIR) luminescent materials are important components for compact light sources used in food testing, medical and biosensing applications. A major long‐term challenge facing NIR luminescent materials is to design ultrabroadband phosphors activated by the rare‐earth ions characterized by the f – d transition. Here, an Eu 2+ ‐doped Ba3 Lu(BO3 )3 phosphor, showing peculiar luminescence characteristics such as a long emission wavelength ≈720 nm, a broader full width at half maximum of ≈197 nm, a large Stokes shift of ≈8300 cm –1, and a longer decay time ≈5.58 µs, is reported. The smaller Eu 2+ occupy the irregular and larger Ba 2+ sites further reducing the symmetry, resulting in the increased splitting of the degenerate 5d level, thereby lowering the energy of Eu 2+ emission. The longer decay time is also associated with the irregular Ba sites. This work improves the NIR mechanism of Eu 2+ and opens up a new idea for exploring promising broadband NIR luminescent materials. Abstract : In response to ultraviolet–blue light, Eu 2+ ‐doped layered double borate phosphor with ultrabroadband near‐infrared (NIR) emission peak at 720 nm is reported. This work extends the perception of the d – f transition of Eu 2+ and provides a strategy to design Eu 2+ doped phosphors with ultrabroadband long wavelength or NIR emission by occupying irregular and large sites in solids.