Ba2+离子掺杂CsPbBr3蓝光量子点合成及其光学性能

近年来,全无机卤素钙钛矿CsPbX3(X=Cl,Br,I)因其荧光带宽窄、带隙可调、合成工艺简单以及荧光量子产率(Photoluminescence quantum yield,PLQY)高等优点而被应用于光电器件领域.但相比于PLQY接近于100％的红光与绿光CsPbX3量子点,PLQY低于10％的蓝光量子点光学性能...

Synthesis and Optical Properties of Barium Doped CsPbBr3 Blue Luminescence Quantum Dots

In recent years,all-inorganic halide perovskite CsPbX₃(X=Cl,Br,I)has attracted tremendous attention owning to its narrow emission full width at half maximum,tunable bandgap,low production cost,and high photoluminescence quantum yield(PLQY).However,the blue luminescence perovskite quantum dots(QDs)is still lag behind their red and green luminescence counterparts.Herein,the Ba²⁺ ion doped CsPbBr₃ QDs was obtained by adjusting the molar ratio of BaBr₂ and PbBr₂ in precursor solution.The crystal structure,morphology,and optical property of as-prepared QDs were studied.The results exhibited that the decrease of particle size and blue shift in absorption and photoluminescence spectra as the increase of the Ba/Pb molar ratio.It is mainly contributed that the ionic radius of Ba²⁺ is smaller than Pb²⁺ ion,and the bandgap of as-prepared quantum dots is enlarged by partially replacement Pb²⁺ ion with Ba²⁺ ion.The particle size is decreases from 11.37 nm(undoped)to 10.36 nm(Ba/Pb molar ratio of 1.0).The photoluminescence is blue shift from 510 nm(undoped)to 461 nm(Ba²⁺ ion doped).Most interesting,the Ba²⁺ doped CsPbBr₃ quantum dot with the Ba/Pb molar ratio of 0.5 demonstrated the super blue luminescence at 461 nm with PLQY of 39%.It is certified that the optical property could be effectively improved by introducing appropriate amount Ba²⁺ ion to partially replacement of Pb²⁺ ion.