2013
DOI: 10.1016/j.optmat.2013.06.030
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Upconversion under polychromatic excitation: Y2SiO5:Pr3+, Li+ converts violet, cyan, green, and yellow light into UVC

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Cited by 46 publications
(26 citation statements)
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“…The intensity of upconverted light is then used to estimate the water treatment rate in the same manner described for UVC LEDs. Current upconversion materials (Table S6) are characterized by low QE values, <0.2%, 107,108 and narrow absorption bands, no wider than ∼100 nm. 106,109 The water treatment rates are calculated with the following assumptions:…”
Section: Environmental Science and Technology Lettersmentioning
confidence: 99%
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“…The intensity of upconverted light is then used to estimate the water treatment rate in the same manner described for UVC LEDs. Current upconversion materials (Table S6) are characterized by low QE values, <0.2%, 107,108 and narrow absorption bands, no wider than ∼100 nm. 106,109 The water treatment rates are calculated with the following assumptions:…”
Section: Environmental Science and Technology Lettersmentioning
confidence: 99%
“…The intensity of upconverted light is then used to estimate the water treatment rate in the same manner described for UVC LEDs. Current upconversion materials (Table S6) are characterized by low QE values, <0.2%, , and narrow absorption bands, no wider than ∼100 nm. , The water treatment rates are calculated with the following assumptions: (1) research is represented by a praseodymium-doped phosphor with an absorption peak at 447 nm and a QE of 0.2%, , and (2) theoretical maximum performance is represented by an ideal hypothetical material with a 100 nm wide absorption band centered at peak solar energy flux and a QE of 100% (Figure d). Upconversion technology remains in the embryonic phase in terms of technical maturity with no present industrial disinfection applications.…”
Section: Solar Water Disinfection Technologiesmentioning
confidence: 99%
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“…Reports on luminescence properties show that high energy phosphor materials comprise oxygen‐based systems. There have been many reports on oxygen‐based UC materials, such as Y 2 O 3, [ 10 ] Bi 2 Ti 2 O 7, [ 11 ] CaTiO 3, [ 12 ] and Y 2 SiO 5, [ 13 ] however oxygen‐based phosphor material systems possess high photon energy in the host molecules due to stretching vibrations. By contrast, fluoride‐based phosphor material systems such as NaYF 4 , offer the advantage of a good host lattice with low photon energy, which results in minimization of quenching of the rare‐earth ion excited state.…”
Section: Introductionmentioning
confidence: 99%
“…The emission on UV‐C range comes from the parity allowed transitions from the lowest crystal field component of the 4f n‐1 5d 1 configuration to the lowest terms of the 4f n ground state configuration. Recently, various ultraviolet upconversion phosphors have been developed––for example, Er 3+ ‐doped BaGd 2 ZnO 5 , Y 0.595 Gd 0.2 Yb 0.2 Tm 0.005 F 3 and Y 2 SiO 5 :Pr 3+ . While this is an elegant way to produce UV‐C radiation, the upconversion process derived from multiple stepwise excited state absorption generates low emission intensities.…”
Section: Introductionmentioning
confidence: 99%