Performance Enhancement of MAPbBr3 Perovskite Quantum Dot for Wide Color Gamut LED via Double Short-chain Ligand Modification - Details

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EI Scopus

Abstract：

Quantum　dots(QDs)exhibit　excellent　optical　properties　with　their　size　tunability,excellent　photoluminescence　quantum　yield(PLQY),and　broad　spectral　absorption,making　them　an　ideal　material　choice　for　full-col-　or,wide-gamut　LED　color　conversion　layers.　In　particular,MAPbBr3　quantum　dots(PQDs)are　not　only　easy　to　prepare,but　also　possess　excellent　photovoltaic　properties,and　thus　are　considered　to　be　a　material　with　great　potential　for　commercialization.　However,the　ligands　on　the　surface　of　MAPbBr3　PQDs　are　highly　susceptible　to　detachment　after　their　synthesis,leading　to　an　increase　in　the　density　of　surface　defect　states,which　makes　them　less　stable　under　environmental　factors　such　as　water-oxygen　and　temperature,thus　further　degrading　the　PLQY.　In　this　study,we　propose　an　efficient　one-step　strategy　for　the　synthesis　of　MAPbBr3　PQDs∶MAPbBr3　PQDs　with　excellent　stability　and　high　PLQY,which　were　successfully　synthesized　by　ligand-assisted　redeposition　and　the　innovative　use　of　2-hex-yldecanoic　acid(DA)ligand　to　replace　the　conventional　oleic　acid(OA)ligand　at　room　temperature,and　the　double-short-chain　DA　ligand　was　able　to　establish　a　stronger　coordination　bond　with　the　MAPbBr3　PQDs　compared　with　that　of　the　single-length　carbon　chain　OA　ligand.　The　strong　interactions　between　the　ligands　and　the　PQDs　contribute　to　the　overall　passivation　of　the　lattice　defects,thus　mitigating　the　non-radiative　recombination　process　and　enhancing　the　environmental　stability.　As　a　result,the　modified　MAPbBr3　PQDs　not　only　exhibited　up　to　87.　8%　PLQY,but　also　showed　higher　stability　in　both　water　and　oxygen　environments.　The　PL　peak　of　MAPbBr3　PQDs　modified　with　DA　ligands　remained　at　68.　3%　of　its　original　value　after　being　left　for　half　a　month　in　a　room　temperature　environment,　whereas　OA　ligand-modified　PQDs　exhibited　almost　complete　fluorescence　burst.　Subsequently,the　DA　ligand-modified　green　MAPbBr3　PQDs,red　CsPbBrI2　PQDs,and　blue　CsPbCl1.　5Br1.　5　PQDs　were　coated　and　cured　in　a　polystyrene(PS)environment　to　form　a　film,which　can　be　used　as　a　color　conversion　material　instead　of　the　traditional　phosphors　for　the　backlight　of　light-emitting　diode(LED)displays.　The　color　gamut　is　137.　09%　under　NTSC　standard.　©　2025　Editorial　Office　of　Chinese　Optics.　All　rights　reserved.

Keyword：

Aspect ratio Atomic emission spectroscopy Carbon Quantum Dots Color Defect density Density (optical) Energy efficiency Grain boundaries Laser beams Layered semiconductors Ligands Light sensitive materials Liquid crystals Metamorphic rocks Nanocrystallization Photoluminescence Quantum yield

Community：

[ 1 ] [Li, Gongming]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 2 ] [Cai, Junhu]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 3 ] [Lai, Wenzong]National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou; 350108, China
[ 4 ] [Chen, Xiaogang]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