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    • 3. 发明公开
    • LOW PROFILE SIDE EMITTING LED
    • 低侧面发光LED
    • EP2033233A1
    • 2009-03-11
    • EP07766687.3
    • 2007-06-07
    • Koninklijke Philips Electronics N.V.Philips Lumileds Lighting Company, LLC.
    • SHCHEKIN, Oleg, B.PUGH, MarkHARBERS, GerardKRAMES, Michael, R.EPLER, John, E.
    • H01L33/00
    • H01L33/50H01L33/22H01L33/38H01L33/46H01L33/60H01L2224/13
    • Low profile, side-emitting LEDs (10) are described, where all light is efficiently emitted within a relatively narrow angle generally parallel to the surface of the light- generating active layer (14). The LEDs enable the creation of very thin backlights for backlighting an LCD. In one embodiment, the LED is a flip chip with the n and p electrodes (18) on the same side of the LED, and the LED is mounted electrode-side down on a submount (22). A reflector (34) is provided on the top surface of the LED so that light impinging on the reflector is reflected back toward the active layer (14) and eventually exits through a side surface of the LED. A waveguide layer (30) and/or one or more phosphors layers are deposed between the semiconductor layers (12, 14, 16) and the reflector for increasing the side emission area for increased efficiency. Side-emitting LEDs with a thickness of between 0.2-0.4 mm can be created.
    • 描述了低轮廓的侧面发光LED(10),其中所有的光都在通常平行于发光活性层(14)的表面的相对窄的角度内有效地发射。 这些LED能够为背光LCD创造非常薄的背光。 在一个实施例中,LED是倒装芯片,其中n和p电极(18)位于LED的同一侧,并且LED电极侧朝下安装在基座(22)上。 反射器(34)设置在LED的顶部表面上,使得照射在反射器上的光被反射回有源层(14)并最终通过LED的侧表面出射。 在半导体层(12,14,16)和反射器之间设置有波导层(30)和/或一个或多个荧光体层,用于增加侧面发射面积以提高效率。 可以创建厚度在0.2-0.4mm之间的侧面发光LED。