Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials - Details

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Abstract：

Quantum　dots（QDs）are　widely　used　in　luminescence　and　display，solar　cells，photocatalysis　and　other　fields　due　to　their　excellent　photovoltaic　properties，and　its　discovery　and　synthesis　won　the　2023　Nobel　Prize　in　Chemistry.　Micro-LED　full-color　display　technology　using　quantum　dot　color　conversion　does　not　require　mass　transfer　technology　and　is　expected　to　achieve　large-scale　mass　production.　However，there　are　still　limitations　to　the　performance　and　lifespan　of　quantum　dots　under　intense　Micro-LED　light　excitation.　Based　on，this　paper　studies　the　Micro-LED　color　conversion　technology　and　its　characteristics　based　on　quantum　dot@ordered　mesoporous（QDs@SBA-15）composite　materials.　The　unique　pore　structure　of　the　ordered　mesoporous　materials　not　only　can　effectively　improve　the　Micro-LED　color　conversion　and　light　extraction　efficiency，but　also　the　dense　ordered　mesoporous　material　guarantees　the　stability　of　the　quantum　dots　to　a　certain　extent.　Firstly，we　established　a　Micro-LED　simulation　model　through　the　Finite-difference　time-domain（FDTD）method　to　investigate　the　effects　of　the　particle　size　of　the　quantum　dots　and　the　pore　size　of　the　ordered　mesoporous　materials　on　the　light　extraction　efficiency.　Based　on　the　guidance　of　simulation　results，QDs@SBA-15　composites　were　further　prepared　by　physical　blending　method，characterized　by　transmission　spectroscopy，fluorescence　excitation　spectroscopy　and　UV-Vis　absorption　spectroscopy，and　the　concentration　ratios　were　determined.　Finally，we　combined　this　composite　material　with　polydimethylsiloxane　（PDMS）to　solidify　it　into　a　film　and　studied　its　photoluminescence　performance.　The　experimental　results　showed　that　the　matching　degree　of　the　quantum　dot　particle　size　and　the　pore　diameter　of　the　mesoporous　material，as　well　as　the　concentration　ratio　of　quantum　dots　and　ordered　mesoporous　materials，is　crucial　to　the　luminous　efficiency　of　QDs@SBA-15　composite　materials　and　the　color　conversion　performance　of　Micro-LED.　Through　the　optimization，the　resulting　composites　can　obtain　excellent　luminescence　performance　and　good　environmental　stability，compared　with　the　pure　quantum　dots　color　conversion　layer，the　light　extraction　efficiency　of　the　composite　material　has　been　improved　by　81.　73%，and　the　environmental　stability　of　the　composite　material　has　been　improved　by　14.　33%.　The　color　gamut　of　tri-color　devices　obtained　with　Micro-LED　as　the　blue　light　source　reached　104.　52%　NTSC.　This　research　provides　theoretical　guidance　for　quantum　dot　color　conversion　Micro-LED　display　technology，and　opens　up　a　new　path　to　realize　the　full-color　Micro-LED.　©　2024　Chines　Academy　of　Sciences.　All　rights　reserved.

Keyword：

Absorption spectroscopy Color Composite materials Extraction Finite difference time domain method Light emitting diodes Luminescence Mass transfer Nanocrystals Particle size Pore size Quantum efficiency Semiconductor quantum dots Silicones Solar power generation

Community：

[ 1 ] [Chen, Xiaogang]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 2 ] [Zhao, Mengyun]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 3 ] [Cai, Junhu]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 4 ] [Li, Gongming]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 5 ] [Zha, Nan]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 6 ] [Ye, Yun]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 7 ] [Ye, Yun]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Mindu Innovation Laboratory, Fuzhou; 350108, China
[ 8 ] [Xu, Sheng]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 9 ] [Xu, Sheng]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Mindu Innovation Laboratory, Fuzhou; 350108, China
[ 10 ] [Guo, Tailiang]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 11 ] [Guo, Tailiang]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Mindu Innovation Laboratory, Fuzhou; 350108, China
[ 12 ] [Chen, Enguo]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 13 ] [Chen, Enguo]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Mindu Innovation Laboratory, Fuzhou; 350108, China