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

• All-inorganic perovskite CsPbBr 3 QDs glass was prepared by one-step method. • The self-crystallization mechanism of CsPbBr 3 QDs glass was studied in detail. • The WLED device endows a wide color gamut covering up 88 % of Rec. 2020. • The performance degradation of the LDs device can be fully recovered. Embedded within an inorganic amorphous media, all-inorganic perovskite CsPbX 3 (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 CsPbBr 3 QDs@glass one-step, which maintains the high photoluminescence quantum yield (PLQY 47 %) and narrow full width at half maximum (FWHM 24 nm) of CsPbBr 3 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 CsPbBr 3 and red CsPbBr 1.2 I 1.8 QDs@glass 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. [ABSTRACT FROM AUTHOR]