由下面的禁带发光光谱(wavelength)和晶格(lattice)的图表可以看出,氮化物所覆盖的发光光谱范围是很宽的,是宽禁带的半导体材料,尤其是其混合晶体InGaN可以覆盖整个可见光光谱而AlGaN可以覆盖到深紫外光谱区,这在半导体光电材料中是具有突出的优势。发展相对成熟的III-V族混合晶体例如GaAs,InP等其禁带带宽过小,远远达不到...
Long Wavelength GaN Blue Laser (400-490nm) Development Final Report 2000 for LLNL ProjectMeyer, GDenbaars, S PAbare, ASink, KKozodoy, PHansen, MBowers, JMishra, UColdren, L
In 1993, Nakamura demonstrated the first p-GaN/n-InGaN/n-GaN DH LED [37] with an active layer thickness of 20 nm grown on a c-plane sapphire substrate. The light output power was 125 μW, the external quantum efficiency (EQE) was 0.22% at 20 mA, and the peak emission wavelength ...
Maintenance, Repair & Operations
doping and downsizing effects11,12. Fortunately, the color conversion could be adopted to avoid these weaknesses by applying blue chips to photo-excite the narrow-bandgap emitters, such as phosphor, II–VI quantum dots, or perovskites, for efficient long-wavelength (>550 nm) emissions13,14. ...
Over the past two years, the quantum efficiency of the Cree blue LED has increased significantly. The devices emit light with a peak wavelength of 470 nm with a spectral halfwidth of 70 nm. The optical power output is typically between 12 and 18 μW for a forward current of 20 mA at ...
“blue” wavelength, giving installers a significantly longer working time between liner wet-out and curing. Once installed, the automated curing system pulls the LED light head through the liner, curing the resin almost instantly — up to five times faster than other methods. Instead of waiting...
Twisted Intramolecular Charge Transfer State for Long-Wavelength Thermally Activated Delayed Fluorescence. Chem Mater 25, 3766–3771 (2013). 33. Voyniuk, D. et al. Highly Efficient Blue Organic Light-Emitting Diodes Based on Intermolecular Triplet-Singlet Energy Transfer. J Phys Chem C 117, 22538...
The shorter the wavelength, the greater the contribution. It is assumed that exposure to light at a wavelength of above 480 nm will have no effect. The extensive use of electronic devices and LED lighting, combined with time spent outdoors, means that we are exposed to very high doses of ...
450nm 5000mw Laser Diode Module Blue Number ZN-LDB-007-X DIY Laser Sensor Light Emitting Tube LED Electronic Design Wavelength: 450nm Power: 5000mW Model: ZN-LDG-007 Package: TO9 Ship to Canada AliExpress commitment Free shipping Delivery:Nov. 13 ...