University of California

Neeraj Sharma

Anthony K Cheetham

Gerardo C Diaz

A solar collector device is provided. The solar collector device includes an evacuated tube and a mini-channel tube mounted within the evacuated tube, the mini-channel tube comprising a first plurality of ports for inflow of a heat-transfer fluid and a second plurality of ports for outflow of the heat-transfer fluid to a heat exchange system. The mini-channel tube may have a hydraulic diameter in a range of approximately 3 millimeters to approximately 200 micrometers. The mini-channel tube may have a hydraulic diameter in a range of approximately 200 micrometers to approximately 10 micrometers.

Mini-channel tube solar collector

A red phosphor composition in combination with a semiconductor light emitting device (e.g., VCSEL, LED, or LD), preferably a GaN based device, that emits light at a bright violet-blue light range, i.e., having a wavelength in the range of 400 nm to 600 nm, which can be further combined with green and blue phosphors. The red phosphor composition in the combination is a vanadate combined with yttrium, gadolinium and/or lanthanum and activated with trivalent Eu, Smand Pr, or any combination thereof, with or without Tbas a co-dopant, has the general formula: BiLnVO:A where x=0 to 1, Ln is an element selected from the group consisting of Y, La and Gd, and A is an activator selected from Eu, Smand Pr, or any combination thereof, with or without Tbas a co-dopant. Novel red phosphor compositions are provided when x is greater than 0 and less than 1, preferably 0.05 to 0.5.

Growing community of inventors

Merced, CA, United States of America

Neeraj Sharma