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UCLA researchers in the Department of Materials Science and Engineering have developed a perovskite-embedded organogel with superior water stability and versatile design and mechanical properties.

Solutions of shear-thinning polymers are known to decrease in viscosity as a shear force is applied to the solution. In this work, the inventors show that by pre-shearing a shear-thinning polymer solution mixed with a precursor solution of a semiconducting crystal we can tune the size and morphology of the growing crystals, which governs the optoelectronic properties of the formed crystals. By pre-shearing the solution we are able to lower the viscosity of the solution, which plays a key role in the liquid phase processing (eg., coating processes). By forming a thinner, low-viscosity coating, we are able to tune the nucleation and growth rate of the crystals to form crystals that are smaller and more uniformly distributed in size, leading to a uniform and conformal coating. This approach allows us to coat a uniform layer of semiconducting crystals, which is necessary for developing functional optoelectronic devices.

A new structure for III-N transistors that is able to maintain a high breakdown and operating voltage while improving the gain of the device.

A technique for making relaxed InGaN layers without crystal defects.

A process that results in new capabilities of GaN lasers. Functionalities include surface emission, beam steering, enhanced performance, low waveguide loss, and superior reliability.

An alternative method, using wafer bonding, to connect relaxed nanostructures in the active region with separately grown material.

A surface treatment that can shape the electric field profile in electronic devices in 1, 2, or 3 dimensions.

An m-plane VCSEL with an active region that has thick quantum wells and operation in continuous wave.

A way to reduce leakage current and increase the efficiency of III-Nitride microLEDs via ALD sidewall passivation. 

Improved laser capability using III-Nitride VCSELs as the illumination source for sensing applications of a fluorescent sample.

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Researchers at the University of California, Santa Barbara have created both surface and buried p-type regions without the need for doping the materials with an acceptor.

Methods of physical vapor deposition for III-nitride tunnel junction devices.

A new process for heating vessels used in the ammonothermal growth of group-III nitrides.

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A process that provides a less expensive alternative for growing light emitting material compared to growing on lattice matched native III-V substrates.

A method for generating a stand-alone ceramic phosphor composite for use in solid state white light generating devices that successfully reduces the operating temperature of the phosphor material by 50%, increases lumen output, reduces cost of materials, and decreases preparation time.

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A method of depositing ZnO on III-nitride materials using a multistep approach involving the deposition of a thin seed layer followed by the deposition of a thicker bulk layer.

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A method to control the anisotrophy of strain in semipolar nitride-based active layers of optoelectronic devices while maintaining high device performance and efficiency.