Cadmium-free thick-shelled InP/ZnSeS/ZnS quantum dot (QD) was synthesized using the heating-up approach. This quantum dots was used in inverted quantum dots light emitting diode (QLED) devices. The brightness of the inverted QLED device can reach a brightness of over 10 000 cd m , low turn-on voltage (2.2 V), and high power efficiency (4.32 lm W ).
Nowadays glucose detection is of great importance in the fields of biological, environmental, and clinical analyzes. In this research, we report a zinc oxide (ZnO) nanorod powder surface-coated with carbon material for non-enzymatic glucose sensor applications through a hydrothermal process and chemical vapor deposition method. A series of tests, including crystallinity analysis, microstructure observation, and electrochemical property investigations were carried out. For the cyclic voltammetric (CV) glucose detection, the low detection limit of 1 mM with a linear range from 0.1 mM to 10 mM was attained. The sensitivity was 2.97 μA/cm2mM, which is the most optimized ever reported. With such good analytical performance from a simple process, it is believed that the nanocomposites composed of ZnO nanorod powder surface-coated with carbon material are promising for the development of cost-effective non-enzymatic electrochemical glucose biosensors with high sensitivity.
Cortisol, a steroid hormone, is secreted by the hypothalamic-pituitary-adrenal system. It is a well-known biomarker of psychological stress and is hence known as the “stress hormone.” If cortisol overexpression is prolonged and repeated, dysfunction in the regulation of cortisol eventually occurs. Therefore, a rapid point-of-care assay to detect cortisol is needed. Salivary cortisol electrochemical analysis is a non-invasive method that is potentially useful in enabling rapid measurement of cortisol levels. In this study, multilayer films containing two-dimensional tin disulfide nanoflakes, cortisol antibody (C-M
ab
), and bovine serum albumin (BSA) were prepared on glassy carbon electrodes (GCE) as BSA/C-M
ab
/SnS
2
/GCE, and characterized using electrochemical impedance spectroscopy and cyclic voltammetry. Electrochemical responses of the biosensor as a function of cortisol concentrations were determined using cyclic voltammetry and differential pulse voltammetry. This cortisol biosensor exhibited a detection range from 100 pM to 100 μM, a detection limit of 100 pM, and a sensitivity of 0.0103 mA/Mcm
2
(
R
2
= 0.9979). Finally, cortisol concentrations in authentic saliva samples obtained using the developed electrochemical system correlated well with results obtained using enzyme-linked immunosorbent assays. This biosensor was successfully prepared and used for the electrochemical detection of salivary cortisol over physiological ranges, based on the specificity of antibody-antigen interactions.
Cr3+-doped infrared phosphors are promising candidates
for next-generation phosphor-converted infrared light-emitting diodes
(LEDs) because they can, in principle, tune and convert the luminescence
spectra from an LED chip. However, most studies focus on broad-band
Cr3+-doped phosphors, and the control mechanism of Cr3+-doped phosphors with sharp line emissions remains ambiguous.
Here, we report LiGa5(1–x)Al5x
O8:Cr3+ phosphors
with sharp line emissions. The luminescence analysis reveals the subtle
change of the local structure around Cr3+, which cannot
be well resolved by X-ray diffraction. The deviation between the temperature-dependent
photoluminescence and decay profile is introduced as well. Furthermore,
the morphologies of LiGa5(1–x)Al5x
O8:Cr3+ phosphors
with high aluminum concentration demonstrate their great potential
for mini-LED applications. Finally, an LED package is constructed,
and it reveals the potential for angiographic applications. This study
opens up a new understanding and perspective for Cr3+-doped
sharp emission phosphors and reveals their potential for LED applications.
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