Researchers at the King Abdullah University of Science and Technology in Saudi Arabia and the Old King Technology City have proposed a novel approach that can fill the "green-yellow" common in multi-phosphor-based white LED applications due to poor conversion efficiency.
In the research paper published in the journal ACS Photonics, "True Yellow Light-Emitting Diodesas Phosphor for Tunable Color-Rendering Index Laser-Based White Light", a nanowire LED (NWLED) emitting at 588 nm is described. Can be grown on low cost titanium (Ti) thin film/silicon (Si) substrate platforms compatible with CMOS processes. Its compact nanowire layer can grow to a surface density of 9x109 cm^2 with a fill factor of 88%.
Each nanowire pi-nLED structure is embedded in an active region of a stack of 5 layers of 3 nm thick InGaN quantum discs (Qdisks) separated by 10 nm quantum barrier layers.
When operating the yellow-light nanowire LED alone, the researchers observed a peak emission of 588 nm and a low on-voltage of about 2.5 V at 29.5 A/cm^2 (about 75 mA on a 0.5x0.5mm^2 component), internal The quantum efficiency is about 39%, and the "efficiency reduction" does not occur until the implantation density of 29.5 A/cm^2 is reached.
20161101 LED NT01P3 SEM image of component structure using two temperature step growth method
Next, the researchers showed the benefits of mixing this yellow light with red, green, and blue laser diodes. In the actual setup, the RGB beam is used to illuminate the yellow nanowire LED, just like a phosphor, and a light scattering layer is used in the reflective configuration to add its yellow light emission to the white light mixture.
LEDNT01P2 component structure shows multiple nanowires growing side by side
The result is a correlated color temperature of approximately 6000K and a color rendering index of 87.7.
LED NT01P1 yellow light nanowire LED
Boon S. Ooi, director of the KACST Solid State Lighting Technology Innovation Center and professor of electrical engineering, said the goal of this approach is to reduce the intensity of blue light in white light, creating a warm white light that is more friendly to the human eye, while also being based on lasers. Solid-state lighting (SSL) provides a new way to tune color temperature. “At the moment, we have patented this technology,†and this also hints at some future business opportunities.
Dc Gear Motor can be defined as an extension of Dc Motor which already had its Insight details demystified here. A dc gear motor has a gear assembly attached to the motor. The speed of motor is counted in terms of rotations of the shaft per minute and is termed as RPM .The gear assembly helps in increasing the torque and reducing the speed. Using the correct combination of gears in a dc gear motor, its speed can be reduced to any desirable figure. This concept where gears reduce the speed of the vehicle but increase its torque is known as gear reduction.
Application field: usually used Electronic door locks, shutter motor, home audio equipment, sweep the floor machine robot
Features: dc gear motor drive precision, small volume, large torque, low noise, durability, low energy consumption, customized power design,easy installation, easy maintenance;Simplify design and save space.
Method of use: the best stable in horizontal plane, installed on the dc gear motor output shaft parts, cannot use a hammer to knock,knock prone to press into the dc gear motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
Dc geared motors should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
Dc geared motors should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of dc gear motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
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