The analysis of the AMOLED light extraction efficiency
Original: Jiun Chen AMOLED today
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External Quantum Efficiency (EQE) : when photons incident to the surface of the photosensitive material, part of the photon pair inspire photosensitive material, the current, which was formed the electronic collection (such as process through internal electron hole to all incoming photon number is called External Quantum Efficiency (External Quantum Efficiency)
Internal quantum efficiency (ige) : when photons incident to the photosensitive equipment (such as CCD, etc.) surface, that part of the photons is absorbed inspire photosensitive material can produce a pair, a current, the resulting electronic (such as hole recombination process caused by electronic no loss) and the ratio of the absorbed photon, is the internal quantum efficiency (internal quantum efficiency)
External quantum efficiency of OLED devices (EQE) generally only 20%, the vast majority of light energy to the transverse optical waveguide (WG) and metal surface plasmon (SP) form of consumption,
Feasible improvement measures: reflection electrode (anode) at the bottom of the cover to the PDL slope surface, and at the top add insulation (SiNx) to avoid short circuit and leakage; Within the pixel area concave into high refractive index (n> 1.8) transparent organic matter, this kind of structure on the one hand, more photons can be coupled to the high refractive index of organic matter, on the other hand some of the beam can be to match to the (? Int total reflection will happen emergent light back to the device inside, is then broken surface anode effect? AOI to exit),
In actual production, the filling thickness of the organic matter how affect the coupling of light? Need to be further simulation analysis,
AB solution filler only exists in the concave plane; CD package organic filling to the surface of the PDL,
Conclusion from the analysis results: C, D scheme coupling efficiency is relatively lower, the loss of the energy associated with horizontal propagation,
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