Silica-coating of quantum nanorods by a sol–gel process and their photo-bleaching properties

Stable CsPbX3 (Br/Cl) Perovskite Nanocrystal Layer Passivated with Al-Doped CdSe for Blue Light-Emitting Diodes

“…According to the XPS spectrum obtained for the nonirradiated CsPb­(Br/Cl) 3 /CdSe/Al PNCs, the O 1s peak is centered at 519 eV, and a fit to the spectral degradation reveals two peaks located at 516 and 515 eV. The peak located at 519 eV is mainly associated with the Al–O bonds in Al 2 O 3 , whereas the peak at 516 eV is attributed to the O in the Al­(OH) 3 in the Al–OH bonds. , The major factor that contributes to the O 1s peak before irradiation is the oxygen in aluminum hydroxide. Furthermore, the contribution of the Al–OH peak decreased after 2 h of irradiation.…”

“…Thus, surface coatings preserve stability and increase performance. 29 Pietra et al 30 demonstrated that coating Cd and CdS onto PNCs with silica led to significantly decreased water and oxygen penetration. Peng et al 31 proposed a core/shell structure wherein the layer thickness is significantly regulated through subsequent absorption of an ionic layer, but the silica coating reduced the PLQY of the Based on these findings, we determined that the CsPbBr 3 PQD can achieve a PLQY of approximately 90%, which is much greater than the 54% PLQY achieved by rhodamine 6G and the 65% PLQY achieved by CdSe/CdS-Zn/S QDs.…”

“…Several device applications have been widely proven for heterostructures consisting of two or more different materials. − Apart from ion doping, surface coating is an efficient way of preventing PNC degradation. Thus, surface coatings preserve stability and increase performance . Pietra et al demonstrated that coating Cd and CdS onto PNCs with silica led to significantly decreased water and oxygen penetration.…”

Silica coating of indium phosphide nanoparticles by a sol–gel method and their photobleaching properties

“…Accordingly, the result on the dependence confirmed that the InP/SiO 2 nanoparticles exhibited more stable fluorescence than the InP nanoparticles did. In our previous works on silica-coated fluorescent polystyrene microspheres and silica-coated nanoparticles of Cd compounds, the fluorescence of both silica-coated particles diminished more slowly than that of the particles before the silica coating [31][32][33]. Oxygen molecules in the singlet state, that is, at the exited stage, decompose dye molecules [39,40].…”

“…Our previous findings suggest that silica coating provides fluorescence stability for particles other than the fluorescent microbeads. In addition to our works on the fluorescent microbeads, our research group has also performed silica coating of quantum rods (QRs) that are one of the luminescent semiconductor nanoparticles [33], and the silica coating had the same effect on the fluorescence stability as in the case of the fluorescent microbeads. In our work on the QRs, the QRs were surface-modified with polyethyleneimine (PEI) to disperse the QRs in water, and then the QRs were coated with silica with hydrolysis of tetraethyl orthosilicate (TEOS) in water/ethanol solution.…”