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Lumilab
Department of Solid State Sciences
Agoria, November 23, 2012
Green phosphors for high brightness applications
Jonas Joos
Jonas Joos Green phosphors for high brightness applications
OFF ON
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
OFF ON
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
OFF ON
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
OFF ON
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
Conversion phosphor
Principle
Jonas Joos Green phosphors for high brightness applications
Conversion phosphor
Technological Applications
Jonas Joos Green phosphors for high brightness applications
Liquid Crystal Display (LCD)
Phosphors in displays
Laser Phosphor Display (LPD)
Jonas Joos Green phosphors for high brightness applications
Improved efficiency for displays
EBU gamut
Planckian locus
v.s.
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Photoluminescence
Luminescence
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Photoluminescence
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Absence of emission saturation at high fluxes
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Absence of emission saturation at high fluxes
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Absence of emission saturation at high fluxes
Chemical stability
Sr1-xEuxGa2S4
Luminescence
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Photoluminescence
Thermal stability
Quantum efficiency
Absence of emission saturation at high fluxes
Chemical stability
emission
excitation
Sr1-xEuxGa2S4
Luminescence
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Chemical stability
Time (h)
Normalizedintensity
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Time (h)
Normalizedintensity
Sol-gel deposition
20 s
800 RPM
50’
500°C
Transparant
sol
Spin-
coating
Sol on phosphor
(op Si)
Heat
treatment
Al2O3
coating
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Chemical stability
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Time (h)
Normalizedintensity
Sol-gel deposition
Unprotected powder
Sol-gel coated
20 s
800 RPM
50’
500°C
Transparant
sol
Spin-
coating
Sol on phosphor
(op Si)
Heat
treatment
Al2O3
coating
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Chemical stability
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Time (h)
Normalizedintensity
Atomic layer deposition (ALD)
Unprotected powder
Sol-gel coated
Precursor pulse
Reactive gas pulse
Al2O3
coating
Chemical stability
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Time (h)
Normalizedintensity
Atomic layer deposition (ALD)
Unprotected powder
Sol-gel coated
Precursor pulse
Reactive gas pulse
Al2O3
coating
ALD coated
Chemical stability
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Sr1-xEuxGa2S4
Time (h)
Normalizedintensity
Atomic layer deposition (ALD)
Unprotected powder
Sol-gel coated
Precursor pulse
Reactive gas pulse
Al2O3
coating
ALD coated
Chemical stability
emission
excitation
TQ
QE
saturation
stability
SrGa2S4:Eu
Jonas Joos Green phosphors for high brightness applications
Conclusions & Prospects
SrGa2S4:Eu : promising phosphor for displays
chemical stability maintained with coating
6/6
Prospects : Infitec® 3D without filtering
red phosphors
remote phosphors
alternative dopants
-
-
-
-
-
-
-
Jonas Joos Green phosphors for high brightness applications
SrSi2O2N2:Eu2+ ZnGa2S4:Eu2+
Ba3Si6O12N2:Eu2+ SrGa2S4:Eu2+
Thank you!
Jonas Joos Green phosphors for high brightness applications

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Green phosphors for high brightness applications