版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進(jìn)行舉報或認(rèn)領(lǐng)
文檔簡介
1、LED industrial applicationAbstract LED (Light Emitting Diode), light-emitting diode, is a solid state semiconductor devices, which can directly convert electric energy into light energy. LED is the heart of a semiconductor wafer, the wafer is attached LED lamp line on a bracket, is negative, the oth
2、er end is connected to the positive electrode of the power, the wafer is epoxy resin package. Semiconductor chip is composed of two parts, one part is a P type semiconductor, it inside the hole is dominant, the other side is the N type semiconductor, here is mainly electronic. But linking the two se
3、miconductor, a P-N junction is formed between them. When the current through the wires on the chip, the electron will be to P area, complex in area P of electrons and holes, and then to form a photonic energy, this is LED light-emitting principle. The wavelength of light determines the color of ligh
4、t, is formed by the P-N node decisions materialskeyword light-emitting diode P type semiconductor N type semiconductor epoxy resin phosphor electron holeForeword1.1 INTRODUCTION Lighting is the human civilization to a great revolution in the light from the darkness, it reflects the human very intell
5、igent, on behalf of the development of history. With the rapid development of industry, people lighting the lamp is not limited to just the lighting. With the high-tech, human demand of environmental protection continuously increasing, energy saving, no pollution, low energy consumption, more and mo
6、re attention by the people, so LED also slowly into peoples eye. LED lighting technology is good, high content of science, because there is no ordinary light bulb filament burn, easy to produce heat deposition, light conditions, long service life, also known as longevity lamp, life is ten times more
7、 than traditional incandescent lamp. It is rich in color, energy saving and environmental protection, green lighting products lighting industry the most fashionable.Should use The composition of a.LED: LED lighting is from LED III-V compounds, such as GaAs (GaAs), GaP (GAP), GaAsP (GaAsP), made of a
8、 semiconductor, which is the core of PN junction. So it is with the characteristics of I-N P-N node, namely the forward conduction, stop, reverse breakdown characteristics. In addition, under certain conditions, it also has the light emitting characteristics. In the forward voltage, electron from ar
9、ea N injected into the P region, P region, N region by injecting hole. Minority carrier into other areas (minority) and a portion of the majority carrier (multi) compound and light. Theory and practice prove, semiconductor material band gap width of Eg peak wavelength of light and emitting region, i
10、.e. lambda = 1240/Eg (mm) in which Eg is the unit of electron volts (eV). If you can produce visible light (wavelength 380nm in purple to red 780nm), semiconductor materials Eg should be between 3.26 1.63eV. The long light than the red light to infrared light. Now the existing infrared, red, yellow,
11、 green and blue light emitting diodes, but the blue diode cost, the price is high, the use is not widespread. Light-emitting principle of LED: LED is light emitting diode, light-emitting diode, is a semiconductor devices semiconductor divided into intrinsic semiconductor, doped semiconductor, diode
12、is doped semiconductor, add 5 valence elements in semiconductor (the people join hole or electron in a semiconductor, semiconductor electronic failure constraints), the electron elegant action, so that the electronic directional mobile form current. LED is made in the principle of the diode, the P/N
13、 junction with epoxy resin dip sealed up, adding fluorescent powder is packaged with a low voltage, high brightness, long life. The relevant parameters of LED: (1) the maximum allowable power dissipation Pm: allows to both ends of LED positive DC voltage and the current flowing through it of the pro
14、duct. Beyond this value, the LED heating, damage. (2) the maximum DC current IFm: maximum DC current allows the. Beyond this value can damage the diodes. (3) the maximum reverse voltage VRm: maximum reverse voltage allowed by the. Beyond this value, the light-emitting diode may be breakdown. (4) the
15、 ambient temperature range of working environment of topm: light emitting diode can work normally. Below or above this temperature range, light emitting diode will not work properly, the efficiency is greatly reduced.Advantages and application of two.LEDAdvantage. High energy: energy saving and no p
16、ollution for environment protection. DC drive, ultra low power (single 0.03-0.06 Watt) electro-optical power conversion close to 100%, the same lighting effect than the traditional energy-saving light source above 80%. Long service life: LED light source is called longevity lamp, is never extinguish
17、ed the lamp. Solid cold light source, epoxy resin packaging, light and no loose parts of the body, there is no filament light-emitting burnability, thermal deposition, depreciation and other shortcomings, the service life of up to 60000 to 100000 hours, than the traditional light source life 10 time
18、s longer than. Changeable Magic: LED light source can use red, green, blue three primary colors of the computer technology, in under the control of the three colors with 256 gray levels and arbitrary mixed, can produce 256 x 256 x 256=16777216 colors, be the most changeful form a combination of different colors, to realize the dynamic changes and all kinds of rich and colorful images. The benefit of environmental protection: environmental benefits, no ultraviolet and infrared spect
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫網(wǎng)僅提供信息存儲空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- 贛南醫(yī)學(xué)院《園藝學(xué)實(shí)驗(yàn)》2023-2024學(xué)年第一學(xué)期期末試卷
- 甘肅中醫(yī)藥大學(xué)《種子檢驗(yàn)技術(shù)》2023-2024學(xué)年第一學(xué)期期末試卷
- 《港口起重機(jī)械說》課件
- 小學(xué)生課件模板圖片
- 安全取暖主題班會課件
- 七年級道德與法治上冊第四單元生命的思考第八課探問生命第1框生命可以永恒嗎說課稿新人教版
- 小學(xué)生觀看黨的課件
- 三年級科學(xué)上冊第三單元天氣與我們的生活第十五課一周的天氣教案青島版
- 礦區(qū)消防安全課件
- 校園課件安全事故
- 市場營銷習(xí)題庫(附參考答案)
- 2024年馬拉松比賽項(xiàng)目合作計劃書
- 2024年演出經(jīng)紀(jì)人資格《思想政治與法律基礎(chǔ)》考前必刷必練題庫500題(含真題、必會題)
- 苗圃購銷合同范本
- 《二十四節(jié)氣融入幼兒園教育活動的個案研究》
- 麻醉與舒適醫(yī)療
- 全國林草行業(yè)森林消防員技能競賽理論知識考試題及答案
- GB/T 44899-2024商品條碼散裝和大宗商品編碼與條碼表示
- 高考英語一輪復(fù)習(xí)知識清單(全國版)專題06 語法填空倒裝句100題(精練) 含答案及解析
- 侵入性器械(操作)相關(guān)感染防控制度的落實(shí)
- 土方開挖及周邊環(huán)境保護(hù)方案
評論
0/150
提交評論