LED manufacturing process stage, to enhance
the efficiency of LED light-emitting method. Raise LED luminous
efficiency, which is to enhance the external LED components to the
photon number can be measured by dividing the number of electrons
between the external injection ratio of LED. The main factors affecting
the luminous efficiency of internal quantum efficiency (Internal
Quantum Efficiency) and the efficiency of taking light (Light
Extraction Efficiency) to upgrade. The internal quantum efficiency,
said second light-emitting layer from the LED emits photons per second,
divided by the number of electrons injected from the outside. Simply
put, that is, electro-optical conversion efficiency of LED components
themselves mainly with their own properties, such as components,
materials, components, energy band, defect, impurity, and the
composition and structure of components and other related epitaxy. LED
light efficiency is taken internally generated photons, after a device
itself, absorption, refraction, reflection after the fact could be the
amount of external components, the number of photons detected. Affect
the efficiency of LED light to take factors such as LED electrical
characteristics (Electrical Efficiency), LED light to take the
efficiency of grain (Extraction Efficiency), and the efficiency of LED
packaging (Packaging Efficency). LED is currently limited by the uneven
distribution of material to absorb and current as well as the loss of
such factors as the critical angle, so in the amount of light emitted
by light-emitting layer, only a small part of the real issue out from
the LED. In other words, even if the LED internal quantum efficiency
high, but the LED light outside can actually receive very little, so
take light LED technology, there is still much to enhance the
efficiency of the bottleneck to be overcome.
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