LED Light Emission

Historic gas street lamps in cities like Berlin, Prague and Warsaw can now be upgraded to energy-saving LED technology, thanks to a solid-state retrofit designed by Berlin-based Braun Schaltgeräte & Service with assistance from LED solutions provider Future Lighting Solutions.

0p narutothief 09-10-2013 45 6   Download

Đèn chỉ thị 7 đoạn: Đèn chỉ thị 7 đoạn gồm 7 diode phát quang (LED: Light Emission Diode) hay 7 chỉ thị tinh thể lỏng (LCD: Liquid Crystal Display). Mỗi bit được thể hiện bằng một đoạn sáng a, hoặc b, hoặc c... đến g. Có hai loại chỉ thị 7 đoạn: - Anot chung - Catot chung

7p vetnangcuoitroi123 11-11-2013 177 17   Download

In this paper, we present a review of enhancement and wavelength shift of abnormal upconversion green light emission from erbium ions doped in silica with narrow linewidth in the metallic-coated microsphere cavity. Although the phenomenon of the 537 nm- green light emission is not yet understood, its enhancement of several orders of magnitude seems to be due to the excitation of plasmons. The metallic-coated microsphere cavity has led to the lowest threshold so far observed in microsphere cavity lasers from 0.2 mW to 60 nW.

7p thuyliebe 09-10-2018 23 0   Download

White light emitting diodes (WLEDs) were made by coating organic and inorganic hybrid composites on blue LED chips. Y3Al5O12:Ce (YAG:Ce) nano powder prepared by lowtemperature Sol-Gel method exhibited a broadband green emission spectrum with the peak at 521 nm.

7p thuyliebe 12-10-2018 11 0   Download

Optical Transmitters The role of the optical transmitter is to convert an electrical input signal into the corresponding optical signal and then launch it into the optical fiber serving as a communication channel. The major component of optical transmitters is an optical source. Fiber-optic communication systems often use semiconductor optical sources such as light-emitting diodes (LEDs) and semiconductor lasers because of several inherent advantages offered by them.

56p khinhkha 29-07-2010 76 7   Download