Abstract:
A semiconductor device is provided that includes a Group III nitride based superlattice and a Group III nitride based active region comprising at least one quantum well structure on the superlattice. The quantum well structure includes a well support layer comprising a Group III nitride, a quantum well layer comprising a Group III nitride on the well support layer and a cap layer comprising a Group III nitride on the quantum well layer. A Group III nitride based semiconductor device is also provided that includes a gallium nitride based superlattice having at least two periods of alternating layers of InXGa1-XN and InYGa1-YN, where 0≦X
Abstract translation:提供了一种半导体器件,其包括基于III族氮化物的超晶格和在该超晶格上包含至少一个量子阱结构的基于III族氮化物的有源区。 量子阱结构包括包含III族氮化物的阱支撑层,在阱支撑层上包含III族氮化物的量子阱层和在量子阱层上包含III族氮化物的覆盖层。 还提供了一种III族氮化物基半导体器件,其包括具有InXGa1-XN和InYGa1-YN的交替层的至少两个周期的氮化镓基超晶格,其中0&nlE; X <1且0&lt; nlE; Y <1且X不是 等于Y.半导体器件可以是具有III族氮化物的有源区的发光二极管。 有源区可以是多量子阱有源区。
Abstract:
Light emitting devices and methods are disclosed that provide improved light output. The devices have an LED mounted to a substrate, board or submount characterized by improved reflectivity, which reduces the absorption of LED light. This increases the amount of light that can emit from the LED device. The LED devices also exhibit improved emission characteristics by having a reflective coating on the submount that is substantially non-yellowing. One embodiment of a light emitting device according to the present invention comprises a submount having a circuit layer. A reflective coating is included between at least some of the elements of the circuit layer. A light emitting diode mounted to the circuit layer, the reflective coating being reflective to the light emitted by the light emitting diode. In some embodiments, the reflective coating comprises a carrier with scattering particles having a different index of refraction than said carrier material.
Abstract:
Packaged semiconductor light emitting device are provided including a reflector having a lower sidewall portion defining a reflective cavity. A light emitting device is positioned in the reflective cavity. A first quantity of cured encapsulant material having a first index of refraction is provided in the reflective cavity including the light emitting device. A second quantity of cured encapsulant material having a second index of refraction, different from the first index of refraction, is provided on the first quantity of cured encapsulant material. The first and second index of refraction are selected to provide a buried lens in the reflective cavity.
Abstract:
The surface morphology of an LED light emitting surface is changed by applying processes, such as a reactive ion etch (RIE) process to the light emitting surface. In one embodiment, the changed surface morphology takes the form of a moth-eye surface. The surface morphology created by the RIE process may be emulated using different combinations of non-RIE processes such as grit sanding and deposition of a roughened layer of material or particles followed by dry etching.
Abstract:
A light emitting diode is disclosed that includes an active structure, a first ohmic contact on the active structure, and a transparent conductive oxide layer on the active structure opposite the first ohmic contact. The transparent conductive oxide layer has a larger footprint than said active structure. A dielectric mirror is positioned on the transparent conductive oxide layer opposite said active structure and a second contact is positioned on the transparent conductive oxide layer opposite the dielectric mirror and separated from the active structure.
Abstract:
Packaged semiconductor light emitting device are provided including a reflector having a lower sidewall portion defining a reflective cavity. A light emitting device is positioned in the reflective cavity. A first quantity of cured encapsulant material having a first index of refraction is provided in the reflective cavity including the light emitting device. A second quantity of cured encapsulant material having a second index of refraction, different from the first index of refraction, is provided on the first quantity of cured encapsulant material. The first and second index of refraction are selected to provide a buried lens in the reflective cavity.
Abstract:
Light emitting diodes include a diode region having first and second opposing faces that include therein an n-type layer and a p-type layer, an anode contact that ohmically contacts the p-type layer and extends on the first face, and a cathode contact that ohmically contacts the n-type layer and also extends on the first face. The anode and cathode contacts extend on the first face to collectively cover substantially all of the first face. A small gap may be provided between the contacts.
Abstract:
Packaged semiconductor light emitting device are provided including a reflector having a lower sidewall portion defining a reflective cavity. A light emitting device is positioned in the reflective cavity. A first quantity of cured encapsulant material having a first index of refraction is provided in the reflective cavity including the light emitting device. A second quantity of cured encapsulant material having a second index of refraction, different from the first index of refraction, is provided on the first quantity of cured encapsulant material. The first and second index of refraction are selected to provide a buried lens in the reflective cavity.
Abstract:
An LED chip comprising a plurality of sub-LEDs on a submount. Electrically conductive and electrically insulating features are included that serially interconnect the sub-LEDs such that an electrical signal applied to the serially interconnected sub-LEDs along the electrically conductive features spreads to the serially interconnected sub-LEDs. A via is included that is arranged to electrically couple one of the sub-LEDs to the submount. The sub-LED can be interconnected by more than one of the conductive features, with each one of the conductive features capable of spreading an electrical signal between the two of the sub-LEDs.