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    • 25. 发明申请
    • STANDING TRANSPARENT MIRRORLESS LIGHT EMITTING DIODE
    • 标准透明无光发光二极管
    • WO2008060585A2
    • 2008-05-22
    • PCT/US2007023970
    • 2007-11-15
    • UNIV CALIFORNIANAKAMURA SHUJIDENBAARS STEVEN P
    • NAKAMURA SHUJIDENBAARS STEVEN P
    • H01L21/00H01L33/54H01L33/60H01L33/62
    • H01L33/54H01L33/507H01L33/60H01L33/62H01L2224/05568H01L2224/05573H01L2224/16245H01L2224/48237H01L2224/48247H01L2224/48257H01L2224/49107H01L2924/00014H01L2924/181H01L2933/0091H01L2224/48091H01L2924/00012H01L2224/05599
    • An (A1, Ga, In)N light emitting diode (LED) in which multi-directional light can be extracted from one or more surfaces of the LED before entering a shaped optical element and subsequently being extracted to air. In particular, the (A1, Ga, In)N and transparent contact layers (such as ITO or ZnO) are embedded in or combined with a shaped optical element comprising an epoxy, glass, silicon or other material molded into an inverted cone shape, wherein most of the light entering the inverted cone shape lies within a critical angle and is extracted. In addition, the present invention stands the LED on end, i.e., rotates the position of the LED within the shaped optical element by approximately 90° as compared to a conventional LED, in order to extract light more effectively from the LED. The present invention also minimizes internal reflections within the LED by eliminating mirrors and/or mirrored surfaces, in order to minimize re-absorption of the LED's light by the emitting layer (or the active layer) of the LED. To assist in minimizing internal reflections, transparent electrodes, such as ITO or ZnO, may be used. Surface roughening by patterning or anisotropically etching (i.e., creating microcones) may also assist in light extraction, as well as minimizing internal reflections.
    • 一种(A1,Ga,In)N发光二极管(LED),其中可以在进入成形光学元件之后随后将其提取到空气中,从LED的一个或多个表面提取多方向光。 特别地,(A1,Ga,In)N和透明接触层(例如ITO或ZnO)嵌入或者与包含模制成倒圆锥形的环氧树脂,玻璃,硅或其它材料的成形光学元件组合, 其中进入倒锥体的大部分光线处于临界角内并被提取。 此外,为了从LED更有效地提取光,本发明将LED结束,即将LED在成形光学元件内的位置与常规LED相比旋转大约90°。 本发明还通过消除反射镜和/或镜像表面来最小化LED内部的内部反射,以便通过LED的发射层(或有源层)使LED的光的再吸收最小化。 为了帮助最小化内部反射,可以使用透明电极,例如ITO或ZnO。 通过图案化或各向异性蚀刻(即,制造微孔)的表面粗糙化也可以有助于光提取,以及最小化内部反射。