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New red phosphor ceramic K2SiF6:Mn4

A new transparent ceramic phosphor for use in LED lighting has been fabricated. The previously reported and optimized narrow-emitting red phosphor, K2SiF6:Mn4+ (KSF), has been consolidated into a transparent ceramic phosphor for the first time, accomplished via hot-pressing the feedstock phosphor po...

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Published in:Optical materials 2020-09, Vol.107 (C), p.110140, Article 110140
Main Authors: Osborne, R.A., Cherepy, N.J., Seeley, Z.M., Payne, S.A., Drobshoff, A.D., Srivastava, A.M., Beers, W.W., Cohen, W.W., Schlagel, D.L.
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cited_by cdi_FETCH-LOGICAL-c309t-187d599ce0e6cbdfe373758b63b4fb1181af1fba3bacc4e8afaabd440bab29973
cites cdi_FETCH-LOGICAL-c309t-187d599ce0e6cbdfe373758b63b4fb1181af1fba3bacc4e8afaabd440bab29973
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container_issue C
container_start_page 110140
container_title Optical materials
container_volume 107
creator Osborne, R.A.
Cherepy, N.J.
Seeley, Z.M.
Payne, S.A.
Drobshoff, A.D.
Srivastava, A.M.
Beers, W.W.
Cohen, W.W.
Schlagel, D.L.
description A new transparent ceramic phosphor for use in LED lighting has been fabricated. The previously reported and optimized narrow-emitting red phosphor, K2SiF6:Mn4+ (KSF), has been consolidated into a transparent ceramic phosphor for the first time, accomplished via hot-pressing the feedstock phosphor powder in a die under vacuum. KSF ceramics were fabricated with varying doping concentrations of Mn4+ and their properties studied. The absorption and emission spectra of the ceramics were identical to the feedstock phosphor powders and are ideal for LED lighting with strong absorption at 450 nm and narrow emission around 630 nm. The absorbance of the ceramics was directly proportional to the doping concentration. The ceramics were excited at various blue light fluxes and their emission intensities measured to study the effect of Mn4+ concentration on intensity-driven “droop” in the emission output. The ceramics with a lower Mn4+ doping were more efficient under higher light fluxes due to a decrease in Auger upconversion losses. KSF ceramics can allow a much longer path length of the diode light through the phosphor, as compared to phosphor-in-silicone, enabling the use of low optical absorption and the associated reduced activator concentration. The ceramics are measured to have a thermal conductivity of ~1.0 W/m-K, higher than that of phosphor-in-silicone or phosphor-in-glass. Several of these properties make KSF ceramics potentially desirable for use in white light LEDs. Greater thermal conductivity helps with heat dissipation, the lower surface area of the ceramic compared to the powder minimizes the environmental vulnerability of KSF, and the ability to lower the Mn4+ concentration reduces Auger recombination losses and mitigates the temperature rise, particularly at higher light flux. [Display omitted] •K2SiF6:Mn4+ transparent ceramics have been formed for the first time.•K2SiF6:Mn4+ transparent ceramics with Mn = 0.045–1 wt% exhibit absorption and emission proportional to doping.•Auger upconversion is suppressed in KSF ceramics with low Mn doping.•Thermal conductivity of KSF ceramic is ~10x better than powder.
doi_str_mv 10.1016/j.optmat.2020.110140
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The previously reported and optimized narrow-emitting red phosphor, K2SiF6:Mn4+ (KSF), has been consolidated into a transparent ceramic phosphor for the first time, accomplished via hot-pressing the feedstock phosphor powder in a die under vacuum. KSF ceramics were fabricated with varying doping concentrations of Mn4+ and their properties studied. The absorption and emission spectra of the ceramics were identical to the feedstock phosphor powders and are ideal for LED lighting with strong absorption at 450 nm and narrow emission around 630 nm. The absorbance of the ceramics was directly proportional to the doping concentration. The ceramics were excited at various blue light fluxes and their emission intensities measured to study the effect of Mn4+ concentration on intensity-driven “droop” in the emission output. The ceramics with a lower Mn4+ doping were more efficient under higher light fluxes due to a decrease in Auger upconversion losses. KSF ceramics can allow a much longer path length of the diode light through the phosphor, as compared to phosphor-in-silicone, enabling the use of low optical absorption and the associated reduced activator concentration. The ceramics are measured to have a thermal conductivity of ~1.0 W/m-K, higher than that of phosphor-in-silicone or phosphor-in-glass. Several of these properties make KSF ceramics potentially desirable for use in white light LEDs. Greater thermal conductivity helps with heat dissipation, the lower surface area of the ceramic compared to the powder minimizes the environmental vulnerability of KSF, and the ability to lower the Mn4+ concentration reduces Auger recombination losses and mitigates the temperature rise, particularly at higher light flux. 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KSF ceramics can allow a much longer path length of the diode light through the phosphor, as compared to phosphor-in-silicone, enabling the use of low optical absorption and the associated reduced activator concentration. The ceramics are measured to have a thermal conductivity of ~1.0 W/m-K, higher than that of phosphor-in-silicone or phosphor-in-glass. Several of these properties make KSF ceramics potentially desirable for use in white light LEDs. Greater thermal conductivity helps with heat dissipation, the lower surface area of the ceramic compared to the powder minimizes the environmental vulnerability of KSF, and the ability to lower the Mn4+ concentration reduces Auger recombination losses and mitigates the temperature rise, particularly at higher light flux. 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KSF ceramics can allow a much longer path length of the diode light through the phosphor, as compared to phosphor-in-silicone, enabling the use of low optical absorption and the associated reduced activator concentration. The ceramics are measured to have a thermal conductivity of ~1.0 W/m-K, higher than that of phosphor-in-silicone or phosphor-in-glass. Several of these properties make KSF ceramics potentially desirable for use in white light LEDs. Greater thermal conductivity helps with heat dissipation, the lower surface area of the ceramic compared to the powder minimizes the environmental vulnerability of KSF, and the ability to lower the Mn4+ concentration reduces Auger recombination losses and mitigates the temperature rise, particularly at higher light flux. [Display omitted] •K2SiF6:Mn4+ transparent ceramics have been formed for the first time.•K2SiF6:Mn4+ transparent ceramics with Mn = 0.045–1 wt% exhibit absorption and emission proportional to doping.•Auger upconversion is suppressed in KSF ceramics with low Mn doping.•Thermal conductivity of KSF ceramic is ~10x better than powder.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><doi>10.1016/j.optmat.2020.110140</doi><oa>free_for_read</oa></addata></record>
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subjects Droop
K2SiF6
LED phosphor
Phosphor ceramic
Red phosphor
Transparent ceramic
title New red phosphor ceramic K2SiF6:Mn4
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