Owing to their nonemissive characteristics, electrochromic materials
promise distinct advantages in developing next-generation eye-friendly
information displays. Yet, it remains a challenge to manipulate the
structure of the materials to achieve a strong memory effect with
high optical contrast, which is of importance for displaying images
with essentially zero energy consumption. Here, we design a mixed
crystalline WO
x
thin film implanted with
massive oxygen deficiencies based on a conventional reactive magnetron
sputtering process. The obtained WO
x
film
exhibits high dual-band optical modulation in both visible (VIS, 99.0%
in 633 nm) and near-infrared (NIR, 94.2% in 1300 nm) regions as well
as an exceptional memory effect (the colored transmittance increases
only by 0.04% at 633 nm after 50 days). The enhanced electrochromic
performance can be attributed to dense Li+-ion binding
sites as well as the trapping effect provided by the massive internal
oxygen deficiencies. The strategy in this work bestows the WO
x
thin film a promising candidate for developing
electrochromic information displays and other energy-efficient devices
as well.
Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances of the degradation models for perovskites and strategies for enhancing the stability of the corresponding light sources are summarized. Improving the stability and quality of perovskite materials is a common way for developing stable perovskite light sources. For strengthening the stability of perovskite light‐emitting diodes, approaches such as surface and interface engineering and employing more stable hole injection layers are effective. To enhance the stability of perovskite amplified spontaneous emission and lasers, methods such as protecting perovskites by materials with high intrinsic thermal conductivity and high stability, better thermal managements, and reducing the threshold carrier densities are useful. This work will be helpful for further prompting the performances, especially the stability of perovskite light sources in this fantastic field.
A novel approach integrates the hetero-interfacial charge carrier management, the photothermal excitation of the carbon sphere core and the injection of hot electrons into the TiO2 shells, consequently enhancing the visible light driven catalysis.
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