Anomalous NIR Luminescence in Mn2+‐Doped Fluoride Perovskite Nanocrystals. Issue 7 (24th March 2014)

• Record Type: Journal Article
• Authors: Song, Enhai; Ding, Sha; Wu, Ming; Ye, Shi; Xiao, Fen; Zhou, Shifeng; Zhang, Qinyuan
• Is Part Of: Advanced optical materials. Volume 2:Issue 7(2014:Jul.)
• Page Start: 670
• Page End: 678
• Publication Date: 2014-03-24
• Subjects: Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201400066
• Languages: English
• ISSNs: 2195-1071

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>An anomalous near‐infrared (NIR) upconversion (UC) emission band at approximately 770 nm is demonstrated in KZnF₃:Yb³⁺, Mn²⁺ nanocrystals with heavy Mn²⁺ doping. This band would enable advanced biological imaging with improved resolution and enhanced penetration depth. Careful studies based on structure analysis, excitation and emission spectra, and luminescence decay curves indicate that this unusual NIR emission (770 nm) originates from the ⁶A_1g(S)⁴T_1g(G)→⁶A_1g(S)⁶A_1g(S) transitions of the Mn²⁺–Mn²⁺ dimers. The influence of Mn²⁺ concentration and temperature on the Stokes and UC luminescence properties are also investigated. The proposed mechanism for the observed NIR UC emission involves ground state absorption and excited state absorption processes. The present results not only provide a useful and effective approach to achieving pure NIR UC emission, and also new insights into the development of advanced photonic devices and technologies.</p> </abstract>