公开(公告)号：US20130207118A1

公开(公告)日：2013-08-15

申请号：US13059633

申请日：2010-12-30

申请人： Deyuan Xiao ,  Richard Rujin Chang

发明人： Deyuan Xiao ,  Richard Rujin Chang

IPC分类号： H01L33/58

CPC分类号： H01L33/58 ,  H01L33/20 ,  H01L2224/14 ,  H01L2224/16225

摘要： The present invention discloses an LED and its fabrication method. The LED comprises: a substrate; an epitaxial layer, an active layer and a capping layer arranged on the substrate in sequence; wherein a plurality of bifocal microlens structures are formed on the surface of the substrate away from the epitaxial layer. When the light emitted from the active layer passes through the surfaces of the bifocal microlens structures, the incident angle is always smaller than the critical angle of total reflection, thus preventing total reflection and making sure that most of the light pass through the surfaces of the bifocal microlens structures, in this way improving external quantum efficiency of the LED, avoiding the rise of the internal temperature of the LED and improving the performance of the LED.

摘要翻译： 本发明公开了一种LED及其制造方法。 LED包括：基板; 一个外延层，一个活性层和一个覆盖层，依次排列在基片上; 其中在所述衬底的表面上远离所述外延层形成多个双焦点微透镜结构。 当从有源层发射的光穿过双焦微透镜结构的表面时，入射角度总是小于全反射的临界角，从而防止全反射，并确保大部分光通过 双焦微透镜结构，以这种方式提高LED的外部量子效率，避免了LED内部温度的升高，并提高了LED的性能。