Wide-band excited and deep-red sensitized Mn 2+ emission from an NaSrSc(BO 3 ) 2 :Eu 2+ ,Mn 2+ phosphor with vanished Eu 2+ emission

• Published in: Dalton transactions : an international journal of inorganic chemistry 2024-02, Vol.53 (7), p.3296-3305
• Main Authors: Fan, Jiaqi, Song, Hongji, Huang, Wenjing, Zhang, Jiahui, Wu, Lingran, Zhou, Chunyan, Wu, Zhan-Chao, Zhang, Xinguo
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d3dt03884j

It is of great importance to develop new broadband red phosphors since they have possible applications like plant cultivation, indoor lighting and non-destructive sensing. Herein, we report a series of Eu , Mn activated NaSrSc(BO ) phosphors a conventional solid-state reaction route. It has been found that both Mn and Eu solo-doped NaSrSc(BO ) show weak or no luminescence, while Eu , Mn co-doped NaSrSc(BO ) exhibits wide-band absorption and intense deep-red emission at 680 nm with color purity of 89%. Analysis of the absorption, excitation and emission spectra of Eu , Mn solo- and co-doped NaSrSc(BO ) indicates that this deep-red broadband emission originates from Eu sensitization of the octahedron Mn T - A transition. It was found that the photoionization process led by energetic similarity of the host band-gap and the Eu lowest 5d excited state was mainly responsible for the vanished luminescence of Eu . The values of internal quantum efficiency (IQE) and absorption efficiency (AE) for the optimal NSSO:0.007Eu ,0.05Mn sample are 24.5% and 61.8%, respectively. This work could provide new insights into exploring novel Mn-activated deep-red luminescent materials.