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Synthesis of CsPbX_(3)(X=Cl/Br,Br,and Br/I)@SiO_(2)/PM M A composite films as color-conversion materials for achieving tunable multi-color and white light emission

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Nano Research 2021年第4期14卷 1187-1194页

作者： Varnakavi Naresh Byung Hyo Kim Nohyun Lee School of Advanced Materials Engineering Kookmin UniversitySeoul 02707Republic of Korea Department of Organic Materials and Fiber Engineering Soongsil UniversitySeoul 06978Republic of Korea

All-inorganic cesium lead halide based perovskite nanocrystals(PNCs)exhibit promising optoelectronic properties,but their poor stability and anion exchange reaction limit their broad commercial ***,we demonstrated the successful synthesis of blue-green-red emitting CsPbX_(3)(X=Cl/Br,Br,and Br/I)PNCs via hot injection method,followed by silica-coating and embedding in poly(methylmethacrylate)(PMMA)*** photoluminescence(PL)spectra of SiO_(2)/PMMA-coated PNCs can be tuned continuously by regulating precursor composition ratio,from blue(CsPb(Cl_(0.5)/Br_(0.5))_(3);460 nm)to red(CsPb(Br_(0.4)/I_(0.6))_(3)via green(CsPbBr_(3);519 nm).The PNCs composite films exhibit improved stability(thermal-,moisture-,and photo-stability)because of the barrier formed by Si0_(2)/PMMA coating and also displayed exceptional photoluminescent quantum yield(PLQY of blue,green,and red-emitting Si0_(2)/PMMA coated PNCs are 37%,86%,and 71%,respectively)with longer lifetimes inhibiting anion ***,the PNCs-encapsulated Si0_(2)/PMMA composite films were integrated into the UV LED chip as down-converting materials to construct a prototype white-peled *** designed white-peled unit demonstrated bright white light generating CIE coordinates(0.349,0.350),a luminous efficiency(LE)of 39.2%and a color rendering index(CRI)of *** wide color gamut of 121.47%of NTSC and 98.56%of Rec.2020 is also achieved with the built w-LED ***,the results demonstrated that CsPbX_(3)(X=Cl/Br,Br,and Br/I)PNCs@SiO_(2)/PMMA composite films can be employed as efficient UV to visible color conversion materials for white-LEDs and backlighting.

关键词： lead halide perovskite nanocrystals hot-injection method long term stability PL quantum yield SiO_(2)/PMMA encapsulation white peled performance

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