✔LED Application✔Narrow emission✔Color tunable19Content： Perovskites nanocrystals (NCs) have attracted much Perovskitesnanocrystals(NCs)haveattractedmuchattentionasattention as emerging optoelectronic materials for the emergingoptoelectronicmaterialsforlight-application of light-emitting devices (LEDs), owing to the emittingdevices(LEDs),owingtotheexcellentphotoluminescenceexcellent photoluminescence quantum yield (PLQY) and narrow quantumyield(PLQY)andnarrowfull-widthhalfmaximumfull-width half maximum (FWHM) with wide color gamut in full (FWHM)withwidecolorgamutinfullvisiblerange.Ingeneral,visible range. In general, perovskite with the chemical formula perovskitewiththechemicalformulaABX3(A+ismonovalentABX3 (A+ is monovalent cation, B2+ is bivalent cation, and X– is cation,B2+isbivalentcation,andX–ishalideanionssuchCl–,Br–,I–halide anions such Cl–, Br–, I–) NCs, are capped by the long alkyl )NCs,arecappedbythelongalkyltoachievecolloidalstabilityinto achieve colloidal stability in non-polar solvent. The LEDs non-polarsolvent.TheLEDsbasedongreen,red,andnear-infraredbased on green, red, and near-infrared perovskites have perovskiteshavedrasticallyimprovedtheexternalquantumdrastically improved the external quantum efficiency (EQE) of efficiency(EQE)ofover20%throughsurfaceligandengineering,over 20% through surface ligand engineering, surface surfacetreatments,energylevelalignmentandbyemployinganewtreatments, energy level alignment and by employing a new approachthatensuresahalide-richcomposition.approach that ensures a halide-rich composition. We focus on a surface engineering of perovskite NCs, such WefocusonasurfaceengineeringofperovskiteNCs,suchasas ligand exchange, anion exchange and metal doping to ligandexchange,anionexchangeandmetaldopingtoachievehighachieve high efficiency LEDs.efficiencyLEDs.Appealing point：Blue perovskite NCs, Lead free perovskite NCs, Highly stable Blue perovskite NCs, Lead free perovskite NCs, Highly perovskite NCs, stable perovskite NCs, Yamagata University Graduate School of Organic Materials ScienceYamagata University Graduate School of Organic Materials ScienceE-mail ・ T-chiba@yz.yamagata-u.ac.jpE-mail : T-chiba@yz.yamagata-u.ac.jpTel ・ +81-238-26-3595Tel : 028-26-3595HP・http://oled.yz.yamagata-u.ac.jp/HP : http://oled.yz.yamagata-u.ac.jp/E-mail ・ nishitsuji@yz.yamagata-u.ac.jp HP ：http://nishitsuji-lab.yz.yamagata-u.ac.jp/Tel ・ +81-238-26-3086HP・http://nishitsuji-lab.yz.yamagata-u.ac.jp/theapplicationofContentSpecial objectivesContentContent：Ourlaboratoryconductsawiderangeofresearchfromthe Our laboratory conducts a wide range of research from the developmentofmaterialsforpolymeralloysandnanocompositestodevelopment of materials for polymer alloys and theevaluationofmechanicalpropertiessuchastensiletestsandnanocomposites to the evaluation of mechanical properties impacttests,aswellasstructuralanalysis.such as tensile tests and impact tests, as well as structural Specifically,firstconsiderwhatkindofmaterialisrequiredforaanalysis.polymeralloythatisamulti-componentsystemcontainingtwoor Specifically, first consider what kind of material is required moretypesofpolymersorananocompositematerialinwhichafillerfor a polymer alloy that is a multi-component system containing isaddedtorubber,anddesignthematerial.Next,thematerialistwo or more types of polymers or a nanocomposite material in melt-kneadedbyanextrudertopreparethematerial.Then,thewhich a filler is added to rubber, and design the material. Next, characteristicsofthemanufacturedmaterialareevaluatedbyvariousthe material is melt-kneaded by an extruder to prepare the evaluationmethods.Whenaninterestingpropertyappears,structuralmaterial. Then, the characteristics of the manufactured material analysisandfracturemechanicswillclarifywhyitappeared.are evaluated by various evaluation methods. When an interesting property appears, structural analysis and fracture Appealingpoint：mechanics will clarify why it appeared. Inthislaboratory,wewillactivelyengageinindustry-academiaSpecial objectivescollaborationinthedevelopmentofnewpolymermaterialsandtheirstructuralanalysis.MystrengthisthatIcandoallthematerial In this laboratory, we will actively engage in industry-productionandmolding.academia collaboration in the development of new polymer materials and their structural analysis. My strength is that I can Yamagata UniversityGraduate School of Organic Materials Sciencedo all the material production and molding.Research Interest ：Polymer PhysicsYamagata University Graduate School of Organic Materials ScienceE-mail ：nishitsuji@yz.yamagata-u.ac.jp Research InterestTel ：+81-238-26-3086Polymer PhysicsPerovskite Nanocrystals for LED ApplicationsDevelopment of high-performance polymer materialsAssistant Professor Takayuki ChibaAssistant Professor Takayuki ChibaAssistant professor Shotaro NishitsujiAssistant professorShotaro NishitsujiPerovskite Nanocrystals for LED ApplicationsDevelopment of high-performance polymer materialsPerovskite Nanocrystals
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