3 research outputs found
Hot-Injection Synthesis Protocol for Green-Emitting Cesium Lead Bromide Perovskite Nanocrystals
All-inorganic
cesium lead bromide (CsPbBr3) nanocrystals
are one of the prominent members of the metal halide perovskite family
of semiconductor materials, which possess considerable stability and
excellent optoelectronic properties leading to a multitude of their
potential applications in solar cells, light-emitting devices, photodetectors,
and lasers. Hot-injection strategy is a popular method used to synthesize
CsPbBr3 nanocrystals, which provides a convenient route
to produce them in the shape of rather monodisperse nanocubes. As
in any synthetic procedure, there are different factors like temperature,
surface ligands, precursor concentration, as well as necessary postpreparation
purification steps. Herein, we provide a comprehensive hot-injection
synthesis protocol for CsPbBr3 nanocrystals, outlining
intrinsic and extrinsic factors that affect its reproducibility and
elucidating in detail the precursor solution preparation, nanocrystal
formation and growth, and postpreparative purification and storage
conditions to allow for the fabrication of high-quality green-emitting
material
Original Core–Shell Structure of Cubic CsPbBr<sub>3</sub>@Amorphous CsPbBr<sub><i>x</i></sub> Perovskite Quantum Dots with a High Blue Photoluminescence Quantum Yield of over 80%
All-inorganic perovskite
cesium lead halide quantum dots (QDs)
have been widely investigated as promising materials for optoelectronic
application because of their outstanding photoluminescence (PL) properties
and benefits from quantum effects. Although QDs with full-spectra
visible emission have been synthesized for years, the PL quantum yield
(PLQY) of pure blue-emitting QDs still stays at a low level, in contrast
to their green- or red-emitting counterparts. Herein, we obtained
core–shell structured cubic CsPbBr<sub>3</sub>@amorphous CsPbBr<sub><i>x</i></sub> (A-CsPbBr<sub><i>x</i></sub>)
perovskite QDs via a facile hot injection method and centrifugation
process. The core–shell structure QDs showed a record blue
emission PLQY of 84%, which is much higher than that of blue-emitting
cubic CsPbBr<sub>3</sub> QDs and CsPbBr<sub><i>x</i></sub>Cl<sub>3–<i>x</i></sub> QDs. Furthermore, a blue-emitting
QDs-assisted LED with bright pure blue emission was prepared and illustrated
the core–shell QDs’ promising prospect in optoelectrical
application
DataSheet1_The Mediating Role of Extra-family Social Relationship Between Personality and Depressive Symptoms Among Chinese Adults.docx
Objectives: This study aims to explore the associations of personality traits and extra-family social relationship with depressive symptoms among Chinese adults.Methods: A nationally representative sample of 29,810 adults aged 16 and above were selected from 2018 CFPS. Personality and depressive symptoms were measured using CBF-PI-15 and the CES-D8 scale. Extra-family social relationship was assessed through the self-rated evaluation. The multiple regression analysis and the PROCESS macro were used for the mediation analysis.Results: Extraversion (OR = 0.807, 95% CI = 0.773, 0.842), agreeableness (OR = 0.795, 95% CI = 0.756, 0.835) and extra-family social relationship (OR = 0.927, 95% CI = 0.913, 0.941) had negative associations with depressive symptoms. Extra-family social relationship could mediate between extraversion and depressive symptoms (Indirect effect = −0.049,95% CI = −0.060, −0.039) as well as agreeableness (Indirect effect = −0.056, 95% CI = −0.068, −0.046) and depressive symptoms. Comparing to females, the indirect effect accounts for a higher proportion of total effect in males.Conclusion: Extra-family social relationship might mediate the association between extraversion and depressive symptoms as well as agreeableness and depressive symptoms.</p