Achieving Ultra‐Broadband Sunlight‐Like Emission in Single‐Phase Phosphors: The Interplay of Structure and Luminescence

Author:

Liu Shuifu12ORCID,Li Liyi1,Qin Xinghui1,Du Rongkai1ORCID,Sun Yifan1,Xie Shixing1,Wang Jiaqi1ORCID,Molokeev Maxim S.34ORCID,Xi Shibo5ORCID,Bünzli Jean‐Claude G.6ORCID,Zhou Lei1ORCID,Wu Mingmei1ORCID

Affiliation:

1. School of Chemical Engineering and Technology/School of Marine Sciences Sun Yat‐sen University Zhuhai 519082 P. R. China

2. College of Materials Xiamen University Xiamen 361005 P. R. China

3. Laboratory of Crystal Physics Kirensky Institute of Physics Federal Research Center SB RAS Akademgorodok 50 bld.38 Krasnoyarsk 660036 Russia

4. International Research Center of Spectroscopy and Quantum Chemistry‐IRC SQC Siberian Federal University 79 Svobodny Ave Krasnoyarsk 660041 Russia

5. Institute of Sustainability for Chemicals Energy and Environment (ISCE2) Agency for Science Technology and Research (A*STAR) 1 Pesek Road Jurong Island 627833 Singapore

6. Institute of Chemical Sciences and Engineering Swiss Federal Institute of Technology Lausanne (EPFL) Lausanne Switzerland

Abstract

AbstractThe quest for artificial light sources mimicking sunlight has been a long‐standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost‐prohibitive and bulky. Therefore, the development of a series of single‐phase phosphors Ca9LiMg1‐xAl2x/3(PO4)7:0.1Eu2+ (x = 0‐0.75) with sunlight‐like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum   spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half‐maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight‐like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad‐spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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