| The Micro-LED display technology based on micro-sized light-emitting diode(LED)arrays is widely recognized as the next-generation display technology.Introducing quantum dot color filter(QDCF)technology into Micro-LED display technology,to form quantum dot color filter Micro-LED(QDCF Micro-LED),will bring better color performance and luminous characteristics,making it an important research direction in the field.However,despite significant progress in color reproduction and brightness,QDCF Micro-LED technology still faces the problem of low conversion efficiency,making it a key issue to convert short-wave excitation light more effectively into colored display light.This thesis proposes a method to enhance the quantum dot color conversion efficiency with metal nanoparticles and conducts research on the enhancement of color conversion efficiency with quantum dot-metal nanoparticle array technology.(1)Theoretical research on the enhancement of color conversion efficiency with quantum dot metal nanoparticle arrays.This includes simulation studies on the enhancement effect of a single metal nanoparticle with a single quantum dot,metal nanoparticle arrays with multiple quantum dots,and the physical mechanism of electromagnetic interaction between metal nanoparticle quantum dot ink mixtures on color conversion efficiency.The results show that the size and arrangement of metal nanoparticles are crucial for the enhancement effect of color conversion,especially silver nanoparticles exhibiting a significant enhancement effect in the visible spectrum.Furthermore,the electromagnetic interaction between metal nanoparticles and quantum dot ink mixtures in the visible light range was simulated to understand the physical mechanism behind the enhancement of quantum dot color conversion efficiency,demonstrating that the localized surface plasmon resonance effect of metal nanoparticles can efficiently excite the quantum dot energy levels and fluorescence radiation,enhancing the quantum dot color conversion efficiency.(2)Process research on the quantum dot material doped with metal nanoparticles and its fluorescence characteristics.The development of quantum dot ink doped with metal nanoparticles and its optical properties were studied.The preparation process of mixing metal nanoparticles with quantum dot ink was studied,obtaining the preparation method of metal nanoparticle-quantum dot ink mixtures with different mixing ratios.The optical conversion characteristics of silicon-coated silver nanoparticles mixed with Cd Se quantum dot ink at different mixing ratios were studied,verifying the enhancement effect of mixed quantum dot ink on color conversion efficiency.The experimental results show that the emission peak intensity is highest at a wavelength of535.67 nm when 10μl of silicon-coated silver solution is mixed with 1 ml of Cd Se quantum dot ink,and the brightness enhancement of green light emission reaches an optimal value of 21.1%in the spin-coated film test,demonstrating a good enhancement effect on color conversion.This provides important experimental basis for the application of metal nanoparticle doped quantum dot ink.(3)Research on the printing process of metal nanoparticle doped quantum dot ink,the characteristics of color conversion efficiency enhancement,and the engineering application verification.Firstly,the development of color conversion Micro-LED carriers was carried out,solving problems such as blue light crosstalk and precise fitting,and bridging the color conversion Micro-LED process through printing and photolithography.Secondly,the actual application of metal nanoparticle doped ink in printing and fabricating color conversion cover plates was studied,focusing on the research of printing process,efficiency improvement,and encapsulation tolerance.The printing process and optical characteristics of doped ink with various concentrations were studied by actual machine(on actual printing equipment).The results show that the properties of the doped ink are stable,and after optimizing the printing process parameters,the printed samples do not produce coffee ring effects,meeting the application requirements.The color conversion efficiency enhancement characteristics of the printed film samples doped with silver nanoparticles were tested,and the fluorescence enhancement rate reached 28.73%,which is consistent with the simulated fluorescence enhancement rate of 39.56%.Finally,the tolerance of the film samples doped with silver nanoparticles to the encapsulation process was studied,and by optimizing the plasma enhanced chemical vapor deposition(PECVD)process,the deposited SiNx packaging protective layer does not significantly alter the optical properties of the sample.The results show that the deposited SiN_x encapsulation protective layer does not significantly change the optical properties of the samples.(4)The main innovations of this thesis are summarized as follows:combining the enhancement effect of the localized surface plasmon resonance field of the metal nanoparticle array with QDCF Micro-LED technology provides a new approach to improving color conversion efficiency;proposing a doping process to incorporate metal nanoparticles into quantum dot ink solves the issues of uniformity and stability of metal nanoparticles,and through optical property analysis,mainly focusing on green light,verifies the method of enhancing the efficiency of quantum dot color conversion with metal nanoparticles;proposing a process scheme of printing/lithography to produce QDCF cover plates,and then precisely bonding them to the Micro-LED backplane,as well as designing double-layer bank to solve the problem of blue light crosstalk,resulting in a full-color sample with 228 PPI and color gamut>107%NTSC;validating that quantum dot ink doped with metal nanoparticles has good printing characteristics,and further developing an optimized PECVD deposited SiN_x encapsulation new process,based on which the research has been granted a U.S.patent and applied in the industry.In conclusion,this thesis conducts a systematic and in-depth study on the enhancement of color conversion efficiency with quantum dot-metal nanoparticle array technology based on the local surface plasmon field enhancement effect.The study first obtains a method to enhance the color conversion efficiency of quantum dots through the local surface plasmon resonance field enhancement effect of metal nanoparticles.The application of metal nanoparticle doped quantum dot ink in Micro-LED color conversion engineering application verification achieves a good effect of color conversion efficiency improvement.The research results of this thesis provide important theoretical and experimental basis for the further development and practical application of quantum dot metal nanoparticle array technology in the field of Micro-LED display and have important referential value for promoting further innovation and development in related fields. |
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