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Li 2 SrSiO 4 :Ce 3+ , Pr 3+ Phosphor with Blue, Red, and Near‐Infrared Emissions Used for Plant Growth LED
Author(s) -
Chen Jiayu,
Guo Chongfeng,
Yang Zheng,
Li Ting,
Zhao Jin
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13952
Subject(s) - phosphor , photoluminescence , analytical chemistry (journal) , absorption (acoustics) , emission spectrum , chemistry , spectral line , absorption spectroscopy , materials science , optoelectronics , optics , physics , chromatography , astronomy , composite material
Ce 3+ /Pr 3+ codoped Li 2 SrSiO 4 ( LSS ) phosphors with blue, red, and near‐infrared ( NIR ) tri‐emission have been prepared via a high‐temperature solid‐state reaction method. Under the excitation of 200 to 400 nm near‐ultraviolet ( n ‐ UV ), the photoluminescence ( PL ) spectra of phosphors are composed of visible and NIR two parts. The former exhibits blue and red emission bands centered at around 428 nm from 5 d –4 f transition of Ce 3+ and 611 nm from 1 D 2 → 3 H 4 transition of Pr 3+ , those overlap with photosynthesis action spectra of plants and absorption spectra of chlorophylls and carotenoids. While the later presents a broad NIR emission band peaking near 1039 nm caused by the 1 G 4 → 3 H 4 of Pr 3+ , matching with the absorption of bacteriochlorophyll. Their emission intensity ratios (B: R: NIR ) could be tuned by altering the relative ratios of Ce 3+ and Pr 3+ concentration in the phosphors to meet the requirements of multifarious plants and bacteria. The efficient energy transfer from Ce 3+ to Pr 3+ takes place in the LSS host, which ascribed to an exchange interaction according to PL spectra and decay curves of phosphors. Results suggest that the present LSS : Ce 3+ , Pr 3+ phosphors have great potential applications in plant growth n ‐ UV LED .