An embodiment provides a phosphor composition and a light emitting device package comprising the same, wherein the phosphor composition comprises green phosphor, amber phosphor, and red phosphor, wherein the amber phosphor is expressed as chemical formula Li.sub.m−2XSi.sub.12-m−nAl.sub.m+nO.sub.nN.sub.16-n:Eu.sup.2+, where 2≦m≦5, 2≦n≦10, 0.01≦X≦1. The light emitting element package of the embodiment can display white light having improved brightness and color rendering index.

A smart light source configured for visible light communication. The light source includes a controller comprising a modem configured to receive a data signal and generate a driving current and a modulation signal based on the data signal. Additionally, the light source includes a light emitter configured as a pump-light device to receive the driving current for producing a directional electromagnetic radiation with a first peak wavelength in the ultra-violet or blue wavelength regime modulated to carry the data signal using the modulation signal. Further, the light source includes a pathway configured to direct the directional electromagnetic radiation and a wavelength converter optically coupled to the pathway to receive the directional electromagnetic radiation and to output a white-color spectrum. Furthermore, the light source includes a beam shaper configured to direct the white-color spectrum for illuminating a target of interest and transmitting the data signal.

[Solving Means] A semiconductor light emitting element includes a first conductive layer, a second conductive layer, and an active layer provided between the first conductive layer and the second conductive layer. The first conductive layer has a current constriction structure, a current injection region being constricted in the current constriction structure. The active layer includes a plurality of quantum well layers, a first light emission wavelength being in a wavelength range of an intensity peak of an entire light emission spectrum, the first light emission wavelength corresponding to a light emission recombination level energy gap of a first quantum well layer of the plurality of quantum well layers, the first quantum well layer being provided at a position closest to the current constriction structure.

The invention relates to a SLED device emitting light from a substrate side, configured to suppress lasing, and comprising a reflective element (55) on a front surface of a substrate (22) configured to redirect an optical beam (light) onto a back surface of the substrate (22). In one embodiment the device can be used for making a compact RGB (red-green-blue) projector.

A superlattice layer including a plurality of periods, each of which is formed from a plurality of sub-layers is provided. Each sub-layer comprises a different composition than the adjacent sub-layer(s) and comprises a polarization that is opposite a polarization of the adjacent sub-layer(s). In this manner, the polarizations of the respective adjacent sub-layers compensate for one another. Furthermore, the superlattice layer can be configured to be at least partially transparent to radiation, such as ultraviolet radiation.

In one embodiment of a superluminescent diode, a first diode adapted on a semiconductor die is to be forward-biased to output optical energy in response to a bias signal, and a second diode adapted on the semiconductor die is to be reverse-biased, the second diode to receive and absorb back propagating optical energy from the first diode and output a measure of the back propagating optical energy as an absorber feedback current. A comparator may be configured to compare the absorber feedback current to a reference current and output a comparison signal, and a driver control circuit coupled to the comparator may provide the bias signal based at least in part on the comparison signal. Other embodiments are described and claimed.

A waveguide coupler may be coupled to a multi-beam light source, such as an array of superluminescent light-emitting diodes. The waveguide coupler includes a substrate having an end facet and a surface, e.g. a top flat surface, adjoining the end facet. At least one tilted reflector is supported by the substrate. A plurality of waveguides supported by the substrate extend between the end facet and the at least one tilted reflector. The at least one tilted reflector is configured to redirect light propagating in the plurality of waveguides to the surface of the substrate. In this manner, the waveguide coupler may provide an array of surface emission points on a substrate. All the surface emission points are disposed in one plane and may be suitably configured for subsequent joint collimation for use e.g. in a scanning projector display.

A smart light source configured for visible light communication. The light source includes a controller comprising a modem configured to receive a data signal and generate a driving current and a modulation signal based on the data signal. Additionally, the light source includes a light emitter configured as a pump-light device to receive the driving current for producing a directional electromagnetic radiation with a first peak wavelength in the ultra-violet or blue wavelength regime modulated to carry the data signal using the modulation signal. Further, the light source includes a pathway configured to direct the directional electromagnetic radiation and a wavelength converter optically coupled to the pathway to receive the directional electromagnetic radiation and to output a white-color spectrum. Furthermore, the light source includes a beam shaper configured to direct the white-color spectrum for illuminating a target of interest and transmitting the data signal.

A superluminescent light emitting diode (SLED) includes an active layer that includes a set of mixed strain quantum wells. The set of mixed strain quantum wells includes a set of compressive strained quantum wells and a set of tensile strained quantum wells. A potential difference applied across the SLED causes movement of electron carriers and hole carriers towards the active layer. Radiative recombination of electron and hole pairs in the set of compressive strained quantum wells enables emission of laterally polarized light and radiative recombination of electron and hole pairs in the set of tensile strained quantum wells enables emission of vertically polarized light. A combination of the laterally polarized light and vertically polarized light results in the emission of incoherent light from the SLED.

A super luminescent light emitting diode includes an active waveguide that is grown using selective area epitaxy, a resistance array, and a contact pad. The active waveguide has a varying bandgap due to a width of the mask that is used for growing the active waveguide. The active waveguide is injected with varying current at each longitudinal section of the active waveguide due to varying resistance associated with the resistance array at each longitudinal section. The varying current is injected by the contact pad. The contact pad is a single continuous electrode. The varying bandgap and varying current at each longitudinal section of the active waveguide enable emission of optical light by each section of the active waveguide such that a combination of all the emitted light leads to emission of a super-broadband continuous spectrum and tailorable spectrum profile of the optical light.