Research On Luminous Characteristics Of Enhanced GaN-LED Based On Surface Plasmons

Gallium nitride-based light-emitting diodes(Light Emitting Diode,LED)have the advantages of high efficiency,low power consumption,and long life span,and are widely used in lighting,visible light communication,full-color display and other fields.However,due to the current quality of semiconductor materials,the luminous performance of LEDs still needs to be improved.In order to further improve the luminous performance of blue GaN-LED,this article has carried out research from two aspects of improving its luminous efficiency and modulation bandwidth.First of all,this article has carried out a detailed study on the overall structure of the LEDs and the principle of p-n junction light emission,analyzed the advantages of the multi-quantum well LED structure,expounded the calculation formula of the internal and external quantum efficiency of the LED,and introduced the two different types,their dispersion relationship,excitation method and other characteristics,the finite element method used in simulation analysis is derived,and COMSOL software is introduced to lay the foundation of simulation.Then,the theory of improving the luminous efficiency of LEDs was studied,combined with the material characteristics of the grating structure,a plasmon-enhanced blue LED composite grating structure model was designed,and the feasibility of the structure manufacturing process was discussed.At the same time,the RF module of COMSOL software is used to optimize the parameters of the structure and simulate analysis,and the radiation power,absorbed power and electric field distribution diagram of the structure under the optimal parameters are obtained.The simulation results show that after parameter optimization,when the wavelength of light emitted by the composite grating LED is 460nm,the average electric field mode radiated into the air is about 38times that of the single grating LED structure,which verifies that the structure can effectively improve the luminous efficiency of the LEDs.Finally,the theory of improving the modulation bandwidth of the LED is studied,and a structural model that can improve the LED’s heat dissipation capacity without destroying the grating structure was designed.In addition,the thermal conduction module of COMSOL software was used to optimize the parameters of the structure and simulate analyze it.The temperature distribution diagram of the structure under the optimal parameters and the current injection density under ideal working conditions were obtained.The simulation analysis showed that under the optimal parameters,the ideal current injection density of the structure is2.387×10~4 A/cm~2,which shows that the structure provides a solid theoretical foundation for the research on improving the modulation bandwidth of the LED.