One-step precipitated all-inorganic perovskite QDs from amorphous media for backlighting display and reproducible laser-driven white lighting

Embedded within an inorganic amorphous media, all-inorganic perovskite CsPbX3 (X = Br, I) quantum dots (QDs) overcome the limitation of poor stability for practical application, which has attracted widespread attention. However, the employed thermal treatment strategies for the melting procedure to obtain the amorphous matrix are time- and energy-consuming. Here, we propose an efficient and cost-saving approach for mass production of CsPbBr3 [email protected] one-step, which maintains the high photoluminescence quantum yield (PLQY 47 %) and narrow full width at half maximum (FWHM 24 nm) of CsPbBr3 QDs. Furthermore, a red shift from 523 to 645 nm of the as-prepared perovskite is achieved by adjusting the halogen composition of the amorphous host from Br to Br/I. Herein, the well-addressed photo- and moisture-stability of the green CsPbBr3 and red CsPbBr1.2I1.8 [email protected] perovskites endow a 118 % National Television Standards Committee (NTSC) and 88 % Rec. 2020 standards color gamut, combined with a commercial blue GaN chip, for state-of-the-art backlighting display. Moreover, it is found that the performance degradation of the laser-driven white lighting device, causing by the damages of high-power laser irradiation, can be fully recovered after a facile thermal treatment process. We believe that the synthesis strategy opens up a new avenue for the large scale synthesis of high quality perovskite QDs with low cost.