White color light emitting diode and neutral color light emitting diode
First Claim
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1. A white color LED comprising:
- an n-type ZnSe single crystal substrate doped with iodine (I), bromine (Br), chlorine (Cl), gallium (Ga), indium (In) or aluminum (Al) which acts both as an n-type dopant and as a self-activated (SA) emission center which absorbs blue or bluegreen light and makes yellow or orange light; and
an epitaxial film structure epitaxially grown on the ZnSe substrate, the epitaxial film structure having a pn-junction and an active layer made of a ZnSe crystal or a ZnSe-related compound crystal for emitting blue light or bluegreen light;
wherein the ZnSe substrate produces and emits white light by mixing the light from the epitaxial film structure with the light from the SA-emission centers.
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Abstract
A white color or neutral color LED having an n-type ZnSe single crystal substrate doped with I, Cl, Br, Al, Ga or In as SA-emission centers and an epitaxial film structure including a ZnSe, ZnCdSe or ZnSeTe active layer and a pn-junction. The active layer emits blue or bluegreen light. The SA-emission centers in the ZnSe substrate convert blue or bluegreen light to yellow or orange SA-emission. The blue or bluegreen light from the epitaxial film structure and the yellow or orange light from the ZnSe substrate synthesize white color light or neutral color light between red and blue.
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19 Claims
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1. A white color LED comprising:
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an n-type ZnSe single crystal substrate doped with iodine (I), bromine (Br), chlorine (Cl), gallium (Ga), indium (In) or aluminum (Al) which acts both as an n-type dopant and as a self-activated (SA) emission center which absorbs blue or bluegreen light and makes yellow or orange light; and
an epitaxial film structure epitaxially grown on the ZnSe substrate, the epitaxial film structure having a pn-junction and an active layer made of a ZnSe crystal or a ZnSe-related compound crystal for emitting blue light or bluegreen light;
wherein the ZnSe substrate produces and emits white light by mixing the light from the epitaxial film structure with the light from the SA-emission centers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A neutral color LED comprising:
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an n-type ZnSe single crystal substrate doped with iodine (I), bromine (Br), chlorine (Cl), gallium (Ga), indium (In) or aluminum (Al) which acts both as an n-type dopant and as a self-activated (SA) emission center which absorbs blue light and makes yellow or orange light; and
an epitaxial film structure epitaxially grown on the ZnSe substrate, the epitaxial film structure having a pn-junction and an active layer made of a ZnSe crystal or a ZnSe-related compound crystal for emitting blue light;
wherein the ZnSe substrate produces and emits neutral color light, by mixing the light from the epitaxial film structure with the light from the SA-emission centers. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification