Vertical light emitting diodes
First Claim
1. A light emitting device comprising:
- a first semiconductor layer having doping of a first type;
a second semiconductor layer having doping of a second type;
a light emitting region interdisposed between the first and second semiconductor layers;
a first electrode layer disposed proximal to the first semiconductor layer and distal to the second semiconductor layer;
a second electrode layer disposed proximal to the second semiconductor layer and distal to the first semiconductor layer; and
a first multilayer reflector stack interdisposed between the first electrode layer and the first semiconductor layer, the first multilayer reflector stack comprising at least a first layer disposed proximal the first electrode layer and a last layer disposed distal the first electrode layer,wherein;
light generated in the light emitting region is extracted from the device through a surface of the second semiconductor layer;
the first multilayer reflector stack extends at least partially across a surface of the first semiconductor layer;
at least 60% of light incident on the first multilayer reflector stack that is generated in the light emitting region is reflected by the first multilayer reflector stack;
at least the first and the last layer of the first multilayer reflector stack are electrically conducting and optically transparent; and
the first multilayer reflector stack is configured for omnidirectional reflectivity.
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Accused Products
Abstract
A tunable color LED module comprises at least two sub-modules, each comprising an LED, a wavelength converting element (WCE) and a reflector cup. The total light emitted by the module comprises light generated from each LED and WCE and the module is configured to emit a total light having a predefined color chromaticity when activation properties of the LEDs are managed appropriately. The total light may have a broad white emission spectrum. The module combines the benefits of a low cost with uniform chromaticity properties in the far field, and offers long and controlled lifetime at the same time as flexibility and intelligence of tunable color chromaticity, Color Rendering Index (CRI) and intensity, either at manufacture or in an end user lighting application. A controlled LED module system comprises a control system for the managing activation properties of the LEDs in the sub-modules. Also described is a method of manufacture.
28 Citations
17 Claims
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1. A light emitting device comprising:
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a first semiconductor layer having doping of a first type; a second semiconductor layer having doping of a second type; a light emitting region interdisposed between the first and second semiconductor layers; a first electrode layer disposed proximal to the first semiconductor layer and distal to the second semiconductor layer; a second electrode layer disposed proximal to the second semiconductor layer and distal to the first semiconductor layer; and a first multilayer reflector stack interdisposed between the first electrode layer and the first semiconductor layer, the first multilayer reflector stack comprising at least a first layer disposed proximal the first electrode layer and a last layer disposed distal the first electrode layer, wherein; light generated in the light emitting region is extracted from the device through a surface of the second semiconductor layer; the first multilayer reflector stack extends at least partially across a surface of the first semiconductor layer; at least 60% of light incident on the first multilayer reflector stack that is generated in the light emitting region is reflected by the first multilayer reflector stack; at least the first and the last layer of the first multilayer reflector stack are electrically conducting and optically transparent; and the first multilayer reflector stack is configured for omnidirectional reflectivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification