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LED1(国外英文资料)
LED1(国外英文资料)
What is the 1.LED?
???? Answer: LED Light Emitting is English Diode light-emitting diode is a semiconductor solid light emitting device, as it is when the two ends with forward voltage of the semiconductor carrier recombination induced photon emission and light.LED can directly emit red, yellow, blue, green, orange, purple, white light emitting materials using solid semiconductor chip. The first commercialdiodes in 1960. Its basic structure is a electroluminescent light emitting semiconductor materials placed in a wire rack then sealed with epoxy resin around to protect the internal core role so the seismic performance LED good.
2.LED???? why is the fourth generation light source (green lighting)?
???? Answer: according to the classification of electric light emitting mechanism: the first generation of light source: resistance such as incandescent lamps. The second generation light source: arc and gas emission such as sodium lamp. The third generation light source light such as fluorescent lamp fluorescent powder. The fourth generation light source: solid light emitting chip such as LED.
???? 3.LED luminescence mechanism and working principle of what?
???? A: the light emitting diode is composed of III-V compounds, such as GaAs (Shen Huajia), GaP (GAP), GaAsP (P Shen Huajia) as its core is made of a semiconductor, p-n junction. So it has the characteristics of general I-N P-N junction, the forward conduction and reverse breakdown characteristics. In addition, the cut-off under certain conditions, it also has the luminescent properties. In the forward voltage by electronic N injected into the P region, N region P region by hole injection. The minority carrier into the other area (minority) part and majority carrier (majority) compound and light.
???? What are the optical properties of 4.LED?
???? Answer: 1.LED light is neither monochromatic light nor broadband light but the balance of two.2.LED light source as point source junction temperature and non po
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