Highly luminescent dual-phase CsPbBr₃/Cs₄PbBr₆ microcrystals for a wide color gamut for backlight displays

Abstract

Cesium lead bromide perovskite nanocrystals (NCs) embedded in Cs4PbBr6 or CsPb2Br5 matrices forming a core/shell structures are promising luminescent materials that exhibit remarkable photoluminescence properties meeting a wide range of...

Compositional engineering of ZnBr2-doped CsPbBr3 perovskite nanocrystals: insights into structure transformation, optical performance, and charge-carrier dynamics

“…In our recent report on the CsPbBr 3 -Cs 4 PbBr 6 composite, it has been shown that green emission originated from the CsPbBr 3 NCs and that Cs 4 PbBr 6 , with its large band gap, passivated the surface defects of the CsPbBr 3 NCs, helping achieve high PLQY and better long-term stability. 22 Thus, the findings from TEM, XRD, and Raman analyses, demonstrating the transformation in morphology and crystal structure are in accordance with the changes observed in absorption and emission spectral profiles. In light of the above results, the following discussion delves into the phase transition occurring from the cubic CsPbBr 3 to hexagonal Cs 4 PbBr 6 NCs, as the ZnBr 2 doping content in CsPbBr 3 increases.…”

“…The GSB is due to the reduction of ground-state ions caused by band-edge filling, while PA is observed at lower and higher excitation states, labeled as PA1 and PA2, respectively. 22,48 TA spectra of CsPbBr 3 and 60% ZnBr 2 -doped PNCs exhibit sharp ground bleach signals at around 512 nm because of a reduction in the quantity of ground-state ions caused by band-edge filling and positive photo-induced absorption bands (PA1 and PA2) at around 484 and 539 nm, respectively. The spectral features of both PNCs are similar, but the bleach recovery signals of the Zn-doped PNCs are slower than those of the pristine PNCs.…”

“…A significant number of recent research efforts have focused on improving the stability and luminescence performance of the LHPNCs by employing various passivation strategies through different synthesis methods. [11][12][13] For instance, the incorporation of PNCs into encapsulating matrices such as ZrO 2 , CdS, ZnS, TiO 2 , mesoporous silica, and mesoporous alumina, [14][15][16][17][18][19] as well as embedding in glass 20 or polymer matrices, 21 the growth of heteroepitaxial structures (e.g., CsPbBr 3 /Cs 4 PbBr 6 and CsPbBr 3 /CsPb 2 Br 5 ), 22,23 and doping with metal cations, 24,25 have enhanced stability to some extent. Surface modification and passivation can help eliminate defect states to some extent, whereas coating with dielectric materials can decrease the conductivity of PNCs and create a barrier for charge injection.…”

A high-performance metal halide perovskite-based laser-driven display

“…It is nearest to the NTSC 2020 (98%) (Table S2, ESI†). From Table S3 (ESI†), the color gamut space of the LD driven backlight panel is wider than that of the other reported works, 45–52 which is the highest one so far. Fig.…”

CsPbBr3/Cs4PbBr6 Quantum Dots in Rigid Lithium Disilicate Glass Ceramics for Lighting and Displays

“…Therefore, the CsPbBr 3 /Cs 4 PbBr 6 composite structure prepared in this work provides a larger optical band gap compared to that of the bulk material. According to the accepted theory in semiconductor QDs, this blueshift of the absorption edge from 540 to 525 nm is attributed to quantum confinement enhancement …”