室温合成具有超纯绿光发射的准二维CsPbBr_(3)钙钛矿纳米片

Room-temperature Synthesis of Quasi-2D CsPbBr_(3) Nanoplatelets with Ultrapure Green Light Emissions

通过配体辅助溶液相法,在室温下成功合成出一种具有超纯绿光发射的准二维CsPbBr_(3)钙钛矿纳米片。该制备方法可以实现低成本、高质量CsPbBr_(3)纳米片的合成。实验结果表明,合成出的CsPbBr_(3)纳米片荧光发射峰位于526 nm,发射峰半高宽(FWHM)能够达到16 nm,纳米片的荧光量子效率(PLQY)高达87%。将CsPbBr_(3)纳米片应用于背光显示,实现了(0.145,0.793)的绿光坐标,该色坐标覆盖近91%的Rec.2020绿光色域,色域范围优于目前报道的绿色荧光粉材料。此外,基于上述CsPbBr_(3)荧光纳米片,我们还成功构筑出一种白光LED器件,并测得该器件在20 mA驱动电流下的发光效率为39 lm/W。

A facile ligand-assisted solution process was proposed to synthesize quasi-2D CsPbBr_(3) perovskite nanoplatelets(NPs)with ultrapure green photoluminescence(PL)at room temperature.The as-synthesized CsPbBr_(3) NPs exhibit an ideal emission peak at 526 nm with a narrow FWHM of 16 nm and a high photoluminescence quantum yield(PLQY)of 87%.As a green downconverter,the CsPbBr_(3) NP shows a CIE coordinate at(0.145,0.793)and covers 91%of the Rec.2020 standard in the CIE 1931 color space,which was much better than that of all the present green phosphors.Moreover,a WLED was successfully fabricated based on these ultrapure green light-emitting CsPbBr_(3) NPs,which exhibits a luminous efficiency 39 lm/W with a CIE(0.33,0.29)under a 20 mA driving current.