Precipitating tunable-emission CsPb(Cl/Br)3 QDs in boro-germanate glass for wide-color-gamut liquid crystal displays

摘要

Embedding CsPbX 3 (X = Cl, Br, I) perovskites QDs in inorganic glass matrix via in-situ crystallizationhasbeenregardedasafeasiblestrategytoimprovetheirstabilityagainstwater,heat,andlightirradi-ation. However, the tunable-emission range of these CsPbX 3 -nanocrystals-embedded glasses is stillnarrow, insufficient to cover a wide color gamut. Herein, a simple synthetic method was developedin this study to obtain the tunable-emission CsPb(Cl/Br) 3 quantum dots (QDs) in boro-germanateglass (CsPb(Cl/Br) 3 QDs@glass) by controlling the molar ratio of PbBr 2 /PbCl 2 . With the increase ofthePbBr 2 concentrationfrom1.6to3.2mol%,theemissionwavelengthofCsPb(Cl/Br) 3 QDs@glassescanbeshiftedfrom448to485nm,andthecorrespondingphotoluminescencequantumyield(PLQY)increases from 0.61 to 24.43%. In addition, the CsPb(Cl/Br) 3 QDs@glass exhibits impressing promo-tionofthermalstability,photostability,andwaterresistanceduetotheexcellentprotectivefunctionoftheglassmatrix.Asaproof-of-conceptexperiment,aLEDdevicewasfabricatedbyemployingtheoptimalCsPb(Cl/Br) 3 QDs@glasswithacommercial375nmUVchip,yieldinganintensecyanlight.AlltheresultsindicatethattheinvestigatedCsPb(Cl/Br) 3 QDs@glassesmayfindpromisingapplicationsas color convertors in wide-color-gamut liquid crystal displays (LCDs).