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1、L E D What is LED ? Important Significance and Application Basic Structure of LED and its illuminant principle Recent Research and Problems ContentsContents What is LED ? Important Significance and Application LED ( Light emitting Diode ) Energy Saving Environment Friendly Long -life lighting source
2、 Application: Optoelectronic Industry Latent advantages in economic development PN Junction For Example, . . . We are surrounded by LED wherever you go and whatever you do 1. LED is a promising industry 2. HB LED, especially white light LED is in urgent demand Application of different light color LE
3、D industry from 2005 to 2011 Basic Structure of LED and its illuminant principle Substrate n zone p zone Transparent conductive layer Active Layer p electrode n electrode Illuminant principle Construction Feature and Current Needs: 1. Wide bandgap semiconductor 2. Increase radiative recombination 3.
4、 Increase electro-optics convertion efficiency Recent Research and Problems Three Parts Epitaxial Wafer Chip Process Packaging Research Technology Substrate and Buffer layer ( Al2O3; SiC; Si ) ( AlN; GaN ) Transparent conductive film (ITO; ZnO ) Surface roughness ( increase critical angular ) PC ( Photonic Crystal ) LEPS Technology DBR (Distributed Bragg Reflection ) TFFC ( Thin Film Flip Chips ) List some technologies and their advantages and disadvantages: Substrate Buffer layer N Zone P Zone ITO/ZnO ITO/ZnO Substrate Substrate Substrate
