Tunable colour LED module

摘要

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.

主权项

1. An LED module comprising a first and a second LED sub-module disposed on a sub-mount including a material having a thermal conductivity greater than 50 W/mK, wherein:
the first LED sub-module includes: a first semiconductor LED for generating light when activated, the first LED being in thermal contact with the sub-mount; a first reflector cup including a material having a thermal conductivity greater than 50 W/mK, the first semiconductor LED being disposed in the first reflector cup; a first encapsulation layer disposed over the first semiconductor LED, the first encapsulation layer including an optically-transparent material; and, a first wavelength converting element (WCE) at least partially disposed over a surface of the first encapsulation layer such that the light emitted from the first semiconductor LED is incident on the first WCE and is re-emitted at a substantially different wavelength; and, the second LED sub-module includes: a second semiconductor LED for generating light when activated, the second semiconductor LED being in thermal contact with the sub-mount; a second reflector cup including a material having a thermal conductivity greater than 50 W/mK, the second semiconductor LED being disposed in the second reflector cup; a second encapsulation layer disposed over the second semiconductor LED, the second encapsulation layer including an optically-transparent material; and, a second wavelength converting element (WCE) at least partially disposed over a surface of the second encapsulation layer such that the light emitted from the second semiconductor LED is incident on the second WCE and is re-emitted at a substantially different wavelength, the second WCE having different wavelength converting properties to the first WCE, wherein: the first and the second semiconductor LEDs are constructed in the same semiconductor material system; the first WCE is at least partially in contact with a side wall of the first reflector cup and the second WCE is at least partially in contact with a side wall of the second reflector cup; the first encapsulation layer is at least partially in contact with the side wall of the first reflector cup and the second encapsulation layer is at least partially in contact with the side wall of the second reflector cup; and, the total light emitted by the module includes the light generated from the first semiconductor LED and the first WCE and the light generated from the second semiconductor LED and the second WCE, the module being configured to emit the total light having a predefined color chromaticity when one or more activation properties of the first and second semiconductor LEDs are managed.