摘要:
A method for increasing the luminous efficacy of a white light emitting diode (WLED), comprising introducing optically functional interfaces between an LED die and a phosphor, and between the phosphor and an outer medium, wherein at least one of the interfaces between the phosphor and the LED die provides a reflectance for light emitted by the phosphor away from the outer medium and a transmittance for light emitted by the LED die. Thus, a WLED may comprise a first material which surrounds an LED die, a phosphor layer, and at least one additional layer or material which is transparent for direct LED emission and reflective for the phosphor emission, placed between the phosphor layer and the first material which surrounds the LED die.
摘要:
A method of fabricating a Light Emitting Diode with improved light extraction efficiency, comprising depositing a plurality of Zinc Oxide (ZnO) nanorods on one or more surfaces of a III-Nitride based LED, by growing the ZnO nanorods from an aqueous solution, wherein the surfaces are different from c-plane surfaces of III-Nitride and transmit light generated by the LED.
摘要:
An epitaxial structure for a III-Nitride based optical device, comprising an active layer with anisotropic strain on an underlying layer, where a lattice constant and strain in the underlying layer are partially or fully relaxed in at least one direction due to a presence of misfit dislocations, so that the anisotropic strain in the active layer is modulated by the underlying layer.
摘要:
A method for reduction of efficiency droop using an (Al, In, Ga)N/AlxIn1-xN superlattice electron blocking layer (SL-EBL) in nitride based light emitting diodes.
摘要翻译:在氮化物基发光二极管中使用(Al,In,Ga)N / Al x In 1-x N超晶格电子阻挡层(SL-EBL)降低效率下降的方法。
摘要:
A light emitting diode (LED) device structure with a reduced Droop effect, and a method for fabricating the LED device structure. The LED is a III-nitride-based LED having an active layer or emitting layer comprised of a multi-quantum-well (MQW) structure, wherein there are eight or more quantum wells (QWs) in the MQW structure, and more preferably, at least nine QWs in the MQW structure. Moreover, the QWs in the MQW structure are grown at temperatures different from barrier layers in the MQW structure, wherein the barrier layers in the MQW structure are grown a temperatures at least 40° C. higher than the QWs in the MQW structure.
摘要:
A yellow Light Emitting Diode (LED) with a peak emission wavelength in the range 560-580 nm is disclosed. The LED is grown on one or more III-nitride-based semipolar planes and an active layer of the LED is composed of indium (In) containing single or multi-quantum well structures. The LED quantum wells have a thickness in the range 2-7 nm. A multi-color LED or white LED comprised of at least one semipolar yellow LED is also disclosed.
摘要:
A method for fabricating a high quality freestanding nonpolar and semipolar nitride substrate with increased surface area, comprising stacking multiple films by growing the films one on top of each other with different and non-orthogonal growth directions.
摘要:
An increase in the Indium (In) content in light-emitting layers of light-emitting diode (LED) structures prepared on nonpolar III-nitride substrates result in higher polarization ratios for light emission than LED structures containing lesser In content. Polarization ratios should be higher than 0.7 at wavelengths longer than 470 nm.
摘要:
A method to suppress thermal conductivities of nitride films by using stacking faults and/or nano-scale In-composition fluctuation(s). Therefore, the present invention reduces thermal conductivity of nitride while keeping electrical conductivity high. In addition, In composition fluctuations can enhance the Seebeck coefficient through thermionic emission. The present invention further discloses a nitride based (e.g. GaN) thermoelectric lateral device with a short length.
摘要:
A semipolar plane III-nitride semiconductor-based laser diode or light emitting diode, comprising a semipolar Indium containing multiple quantum wells for emitting light, having Aluminum containing quantum well barriers, wherein the Indium containing multiple quantum well and Aluminum containing barriers are grown in a semipolar orientation on a semipolar plane.