Luminescent properties and energy transfer of novel NIR K(Ga/Al)11O17:Cr3+, Yb3+ phosphors for solar cells. (June 2021)

• Record Type: Journal Article
• Authors: Wang, Z.; Zhang, L.; Dong, L.; Xu, Y.; Yin, S.; You, H.
• Is Part Of: Materials today energy. Volume 20(2021)
• Publication Date: 2021-06
• Subjects: Rare earth luminescent materials -- NIR phosphors -- c-Si solar cells -- Energy transfer process; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2021.100674
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: Novel Cr 3+ –Yb 3+ codoped KGa11 O17 and KAl11 O17 phosphors (referred to as KGO:Cr 3+, Yb 3+ and KAO:Cr 3+, Yb 3+ ) were prepared via a traditional solid-state method. X-ray diffraction, scanning electron microscope equipped with an energy-dispersive spectrometer, and photoluminescence spectra were used to characterize the phase purity, chemical composition, and luminescence properties of the phosphors. The obtained KGO:Cr 3+ and KAO:Cr 3+ phosphors have high efficiency and broad absorption in the ultraviolet and visible (UV–vis) region. Under 300/420 nm excitation, KGO:Cr 3+ and KAO:Cr 3+ phosphors show deep red emission at about 712 nm. When Cr 3+ –Yb 3+ are codoped into the KGO:Cr 3+ /KAO:Cr 3+ matrix, the effective energy transfer from the Cr 3+ to Yb 3+ ions occurs, thus achieving intense near-infrared (NIR) emission. As a consequence, the high-energy UV–vis light can be efficiently converted into low-energy NIR light in KGO:Cr 3+, Yb 3+ /KAO:Cr 3+, Yb 3+ phosphors based on the energy transfer process of the Cr 3+ →Yb 3+ ions, which matches well with the high spectral response region of crystalline silicon (c-Si) solar cells. The experimental results reveal that KGO:Cr 3+, Yb 3+ and KAO:Cr 3+, Yb 3+ phosphors are promising solar spectral conversion materials for c-Si solar cells. Graphical abstract: Novel NIR phosphors possess broadband absorption in the UV–vis region and strong NIR emission, matching well with the spectral response of the c-Si solar cell and having a potential application for the c-Si solar cell. Image 1 Highlights: Novel KGa(Al)11 O17 :Cr 3+ /Yb 3+ phosphors have been prepared. The phosphors possess broadband absorption in the UV–vis region and strong NIR emission. KGa(Al)11 O17 :Cr 3+ /Yb 3+ phosphors have potential to be used as spectral converter for c-Si solar cells.