Near-infrared downconversion in Eu²⁺and Pr³⁺co-doped KSrPO₄phosphor

Abstract

A novel near-infrared (NIR) downconversion (DC) phosphor KSrPO4:Eu2+, Pr3+ is synthesized by the conventional high temperature solid-state reaction. The Eu2+ acts as an efficient sensitizer for Pr3+ in the KSrPO4 host. With broadband near-ultraviolet light excitation induced by the 4f→5d transition of Eu2+, the characteristic NIR emission of Pr3+, peaking at 974 nm and 1019 nm due to 3P0→1G4 and 1G4→3H4 transitions, is generated as a result of the energy transfer from Eu2+ to Pr3+. The luminescence spectra in both the visible and the NIR regions and the decay lifetime curves of Eu2+ prove the energy transfer from Eu2+ to Pr3+. This Eu2+ and Pr3+ co-doped KSrPO4 phosphor may be a promising candidate to modify the spectral mismatch behavior of crystalline solar cells and sunlight.

Concentration effect of the near-infrared quantum cutting of 1788-nm luminescence of Tm 3+ ion in (Y 1–x Tm x ) 3 Al 5 O 12 powder phosphor

“…All fluorescence lifetime values of 460.0-nm and 800.0nm fluorescences are fit to the measured fluorescence lifetime curves. [2,[5][6][7][8][9][10][11][12] The fitting method is tail fit. The original point is set after equipment response.…”

“…The original point is set after equipment response. It is found from the measurements that the fluorescence lifetime values of 460.0 nm and 800.0 nm of (A) (Y 0.9975 Tm 0.0025 According to the literature about well-known infrared quantum cutting, the energy transfer efficiency of the Tm 3+ ion caused by cross-relaxation energy transfer is determined by the following formula: [2,[5][6][7][8][9][10][11][12] η tr,x%Tm ≈ 1 −…”

“…Therefore a prospective method to enhance solar cell efficiency by quantum cutting is the cutting of a high-energy photon into multiple low-energy photons to adapt the solar spectrum, thus more effectively matching the solar cell. [1][2][3][4][5][6][7][8][9][10][11][12][13] At present, new theories, materials, techniques, designs, and products related to solar cells have been developed at a very rapid speed. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The development of germanium (Ge) solar cells as a new type of solar cells with a narrow band-gap width is very interesting, and has been used in germanium, silicon-germanium, and cascade three-junction solar cells.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] At present, new theories, materials, techniques, designs, and products related to solar cells have been developed at a very rapid speed. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The development of germanium (Ge) solar cells as a new type of solar cells with a narrow band-gap width is very interesting, and has been used in germanium, silicon-germanium, and cascade three-junction solar cells. [4,13,17] The germanium solar cell has the characteristic advantages of a small band-gap width of 0.67 eV: 300 K (5404 cm −1 = 1850.5 nm).…”

“…And about 80 relevant papers have been published in a range of top journals. [2,[5][6][7][8][9][10][11][12][26][27][28][29][30] However, regarding nearinfrared quantum cutting of about 1800-nm luminescence of Tm 3+ ion activator center, only six papers have been reported up to now. [5,8,10,14,27] The present paper studies the concentration effect of the near-infrared multiphoton quantum cutting luminescence phenomena of (Y 1−x Tm x ) 3 Al 5 O 12 powder phosphor.…”