Illuminating device and surface lighting source device and flat display device with the same
A technology of light-emitting device and light-emitting element, which is applied in the parts of lighting device, lighting device, static indicator, etc., can solve the problem that light extraction efficiency needs to be further improved.
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[0037] The present invention has further investigated the structure of the traditional light-emitting diode as shown in FIG. 1 and found that it still has some shortcomings. Since the refractive index of the semiconductor layers 106 and 108 such as GaN is generally about n=2.4, the refractive index of the encapsulation layer 114 is generally about n=1.5. Due to optical characteristics, the light emitted by the light-emitting diode element 105, such as ultraviolet light or blue light, will produce internal total reflection on the interface. In this way, part of the light emitted by the light-emitting diode element 105 will be reflected back to the light-emitting diode element 105 and cannot be used effectively, and may be converted into heat energy after being absorbed by the material of the light-emitting diode element 105, reducing the use of the light-emitting diode element 105 Life and so on. In addition, from the interface between the package body 114 and the air, the relative...
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