Light emitting device, backlight unit and display apparatus
First Claim
Patent Images
1. A light emitting device, comprising:
- a substrate;
a single light emitting element mounted on the substrate, the single light emitting element emitting both blue light and green light, the blue light having a peak in a wavelength range of about 370 nm to 500 nm, and the green light having a peak in a wavelength range of about 500 nm to 600 nm; and
a wavelength conversion part that wavelength-converts a portion of light emitted from the single light emitting element into red light, the wavelength conversion part including fluoride-based phosphors represented by Chemical Formula;
AxMFy;
Mn4+ (2≦
x≦
3 and 4≦
y≦
7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn) and organic or inorganic coating layers enclosing the fluoride-based phosphors, wherein;
emission of the blue light is driven by a first electrode and a second electrode, and emission of the green light is simultaneously driven by the same first and second electrodes that drive emission of the blue light, andthe blue light peak, the green light peak, and a peak of the red light have a full width at half maximum (FWHM) of less than 35 nm.
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Abstract
A light emitting device includes: a substrate; a light emitting element mounted on the substrate and emitting blue light and green light; and a wavelength conversion part wavelength-converting a portion of light emitted from the light emitting element into red light, and including fluoride-based phosphors represented by Chemical Formula: AxMFy:Mn4+ (2≦x≦3 and 4≦y≦7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn) and organic or inorganic coating layers enclosing the fluoride-based phosphors.
47 Citations
19 Claims
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1. A light emitting device, comprising:
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a substrate; a single light emitting element mounted on the substrate, the single light emitting element emitting both blue light and green light, the blue light having a peak in a wavelength range of about 370 nm to 500 nm, and the green light having a peak in a wavelength range of about 500 nm to 600 nm; and a wavelength conversion part that wavelength-converts a portion of light emitted from the single light emitting element into red light, the wavelength conversion part including fluoride-based phosphors represented by Chemical Formula;
AxMFy;
Mn4+ (2≦
x≦
3 and 4≦
y≦
7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn) and organic or inorganic coating layers enclosing the fluoride-based phosphors, wherein;emission of the blue light is driven by a first electrode and a second electrode, and emission of the green light is simultaneously driven by the same first and second electrodes that drive emission of the blue light, and the blue light peak, the green light peak, and a peak of the red light have a full width at half maximum (FWHM) of less than 35 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A backlight unit, comprising:
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a light guiding plate; a light source module disposed on at least one side surface of the light guiding plate, providing light to an interior of the light guiding plate, and including a circuit board and a plurality of light emitting elements, each of the light emitting elements emitting both blue light and green light, the blue light having a peak in a wavelength range of about 370 nm to 500 nm, and the green light having a peak in a wavelength range of about 500 nm to 600 nm; and a wavelength conversion part that wavelength-converts a portion of light emitted from the plurality of light emitting elements into red light, the wavelength conversion part including fluoride-based phosphors represented by Chemical Formula;
AxMFy;
Mn4+ (2≦
x≦
3 and 4≦
y≦
7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn) and organic or inorganic coating layers enclosing the fluoride-based phosphors, wherein;in each light emitting element of the plurality of light emitting elements, emission of the blue light is driven by a first electrode and a second electrode, and emission of the green light is simultaneously driven by the same first and second electrodes that drive emission of the blue light. - View Dependent Claims (11, 12, 13)
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14. A display apparatus, comprising:
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a backlight unit including a light guiding plate and a plurality of light emitting elements, each of the light emitting elements emitting both blue light and green light, the blue light having a peak in a wavelength range of about 370 nm to 500 nm, and the green light having a peak in a wavelength range of about 500 nm to 600 nm; at least one optical sheet disposed on the backlight unit; and a liquid crystal panel disposed on the optical sheet and including a liquid crystal layer and a color filter, wherein; the backlight unit or the liquid crystal panel includes a wavelength conversion part disposed therein, the wavelength conversion part wavelength-converting a portion of light emitted from the light emitting element into red light, the wavelength conversion part including fluoride-based phosphors represented by Chemical Formula;
AxMFy;
Mn4+ (2≦
x≦
3 and 4≦
y≦
7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn), andin each light emitting element of the plurality of light emitting elements, emission of the blue light is driven by a first electrode and a second electrode, and emission of the green light is simultaneously driven by the same first and second electrodes that drive emission of the blue light.
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15. A light emitting device, comprising:
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a substrate; a single light emitting element mounted on the substrate, the single light emitting element emitting both blue light and green light, the blue light having a peak in a wavelength range of about 370 nm to 500 nm, and the green light having a peak in a wavelength range of about 500 nm to 600 nm; a wavelength conversion part that wavelength-converts a portion of light emitted from the single light emitting element into red light, the wavelength conversion part including fluoride-based phosphors represented by Chemical Formula;
AxMFy;
Mn4+ (2≦
x≦
3 and 4≦
y≦
7, where element A is at least one selected from a group consisting of Li, Na, K, Rb, and Cs and element M is at least one selected from a group consisting of Si, Ti, Zr, Hf, Ge and Sn); anda coating layer protecting the fluoride-based phosphors, wherein; emission of the blue light is driven by a first electrode and a second electrode, and emission of the green light is simultaneously driven by the same first and second electrodes that drive emission of the blue light. - View Dependent Claims (16, 17, 18, 19)
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Specification