In Situ Synthesis of Monodispersed CsPbBr₃/P_GMA‐EDMA Microspheres with High Stability for White Light‐Emitting Diodes

Abstract

Recently, perovskite quantum dots (PQDs) have attracted significant attention owing to their excellent optoelectronic properties in efficient white light‐emitting diodes (WLEDs). However, their poor stability for UV irradiation and high temperature hinders their practical applications. In this study, CsPbBr3 inorganic perovskite quantum dots (CPB QDs) are in situ grown into the channels of PGMA‐EDMA microspheres to improve their UV irradiation and thermal stability. Moreover, It is found that the pore structure of the PGMA‐EDMA microspheres can effectively block the aggregation between the CPB QDs, which effectively reduces the anion exchange and self‐absorption of fluorescence. Finally, A WLED is fabricated with the CPB/PGMA‐EDMA microspheres and the red‐emitting BaGe4O9:Eu3+ phosphor as color converters; The Commission Internationale de I'Eclairage color coordinates of the fabricated WLED is (0.33, 0.34), which is close to the standard white emission coordinate (0.33, 0.33). The luminous efficiency of as‐prepared WLED is 34.9 lm W−1 with a color render index (CRI) of 74.6, demonstrating that the CPB/PGMA‐EDMA microspheres are potential for application in lighting and display technologies.

Suppression of Thermal Quenching for CsPbX3 (X = Cl, Br, and I) Quantum Dots via the Hollow Structure of SrTiO3 and Light-Emitting Diode Applications

“…30 The average lifetimes (τ avg ) of blue, green, and red composites are 8.34, 18.27, and 127.42 ns, respectively, which are longer than those reported in some references using the coating strategies. 31,32 The longer lifetime means better luminescence performance and fewer defect states of the PQDs, 33 and it further confirms that the PQDs adsorbed by SrTiO 3 microspheres can effectively improve their thermal stability.…”

Patterning Perovskite Quantum Dots Using Photopolymerization

“…90% in solution), and excellent emission wavelength tunability over the whole visible light region with crystal size and composition (high color tunability). 5,6 These features make perovskite QDs attractive candidates for applications in next-generation light-emitting diodes, 7,8 liquid-crystal display backlighting, 9,10 phosphors, 11,12 and anticounterfeiting labels, 13,14 among others. 15 However, patterning perovskite QDs by precisely positioning them at desired locations on substrates is critical to realizing their applications.…”

“…Recently, all-inorganic cesium lead halide perovskite quantum dots (QDs), that is, CsPbX 3 (X = Cl, Br, and I) QDs, have emerged as a new class of colloidal semiconductor nanocrystals with superior properties. , These perovskite QDs exhibit narrow emission line widths (high color purity), high photoluminescence quantum yields (ca. 90% in solution), and excellent emission wavelength tunability over the whole visible light region with crystal size and composition (high color tunability). , These features make perovskite QDs attractive candidates for applications in next-generation light-emitting diodes, , liquid-crystal display backlighting, , phosphors, , and anticounterfeiting labels, , among others . However, patterning perovskite QDs by precisely positioning them at desired locations on substrates is critical to realizing their applications.…”