Blue light emitting diode with luminous efficiency enhanced by metamaterial and preparation method of blue light emitting diode

Abstract

The invention relates to a blue light emitting diode with luminous efficiency enhanced by the metamaterial. The blue light emitting diode comprises a buffer layer, an n-type GaN layer, a multi-quantum well layer, a metamaterial layer and a p-type layer which are sequentially stacked on a substrate, the metamaterial layer is composed of a hyperbolic metamaterial unit structure array and a GaN covering layer, the GaN covering layer is in contact with the multi-quantum well layer, and the hyperbolic metamaterial unit structure array is formed by arranging hyperbolic metamaterial unit structures formed by stacking Au and Si. The unique structure of the quasi-periodic hyperbolic metamaterial is formed by alternately stacking Au and Si according to the Thue-Morse sequence, and the distance between the quasi-periodic hyperbolic metamaterial structure and the quantum well is relatively short, so that the coupling effect between the surface plasmon polaritons and the multiple quantum wells is relatively strong, and the internal quantum efficiency of the blue light LED is further improved.

Description

technical field [0001] The invention relates to the field of light-emitting diode chips, in particular to a blue light-emitting diode with enhanced luminous efficiency by metamaterials and a preparation method thereof. Background technique [0002] As the third-generation lighting source, light-emitting diodes have the advantages of energy saving, environmental protection, fast response speed, long life, small size, etc., and have been widely used in display, traffic signal, automotive lighting, greenhouse lighting, etc. prospect. [0003] Surface plasmon coupling means that when free electrons interact with light, collective oscillations of these electrons occur near the metal surface and cause resonant absorption and light scattering. This collective resonance will only occur at certain electromagnetic field frequencies. Resonance occurs only when the oscillation frequency of the electrons overlaps with the frequency of the light emitted by the excitons. In the resonanc...

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Problems solved by technology

[0004] However, not all metals in nature can be used for surface plasmon coupling, which means that it is impossible to achieve a high degree of alignment between the surface plasmon resonance frequency and the emission frequency, resulting in lower radiation enhancement and narrow operating wavelength range

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