Wavelength-converting film and light emitting device and display device using the same
AssigneeLextar Electronics Corporation
InventorsChing-Yi Chen, Wen-Wan Tai, Yu-Chun Lee, Tzong-Liang Tsai
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Abstract
A wavelength-converting film and a light emitting device and a display device using the same are disclosed. The wavelength converting film comprises a fluoride phosphor powder with a Mn4+ as an activator, wherein the fluoride phosphor powder with the Mn4+ as the activator comprises a sheet-like crystal and has a chemical formula of A2[MF6]:Mn4+, wherein A is Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof.
Claims19
A wavelength converting film, comprising a fluoride phosphor powder with a Mn4+ as an activator, wherein the fluoride phosphor powder with the Mn4+ as the activator comprises a sheet-like crystal and has a chemical formula of A2[MF6]:Mn4+, and wherein A is Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof, wherein the sheet-like crystal of the fluoride phosphor powder with the Mn4+ as the activator has a thickness d, a crystal flat surface of the sheet-like crystal has a maximum length a, wherein the maximum length a is defined as a distance between two end points on an edge of the crystal flat surface and farthest from each other, and 2.5<a/d≤100.
A light emitting device, comprising:
- a light emitting diode chip;
- and
- a wavelength converting film being capable of being excited by a first light emitted from the light emitting diode chip to emit a second light having a wavelength different from a wavelength of the first light, wherein the wavelength converting film comprises a fluoride phosphor powder with a Mn4+ as an activator, wherein the fluoride phosphor powder with the Mn4+ as the activator comprises a sheet-like crystal and has a chemical formula of A2[MF6]:Mn4+, wherein A is Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof, wherein the sheet-like crystal of the fluoride phosphor powder with the Mn4+ as the activator has a thickness d, a crystal flat surface of the sheet-like crystal has a maximum length a, wherein the maximum length a is defined as a distance between two end points on an edge of the crystal flat surface and farthest from each other, and 2.5<a/d≤100.
A display device, comprising:
- a display panel;
- and
- a light module adjacent to the display panel, wherein the light module comprises:
- a light emitting diode chip;
- and
- a wavelength converting film being capable of being excited by a first light emitted from the light emitting diode chip to emit a second light having a wavelength different from a wavelength of the first light, wherein the wavelength converting film comprises a fluoride phosphor powder with a Mn4+ as an activator, the fluoride phosphor powder with the Mn4+ as the activator comprises a sheet-like crystal and has a chemical formula of A2[MF6]:Mn4+, wherein A is Li, Na, K, Rb, Cs, NH4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof, wherein the sheet-like crystal of the fluoride phosphor powder with the Mn4+ as the activator has a thickness d, a crystal flat surface of the sheet-like crystal has a maximum length a, wherein the maximum length a is defined as a distance between two end points on an edge of the crystal flat surface and farthest from each other, and 2.5<a/d≤100.
Dependencies are inferred from the claim text.