Recently, perovskite nanocrystals (NCs) have been recognized as a substitute for the conventional phosphor color converters, which can improve the color gamut and reproduction of liquid crystal displays (LCDs). However, the issue of instability has always been a stumbling block to practical applications. Here, a novel dual-phase mixed@glass@styrene−ethylene−butylene−styrene (SEBS) (MGS) nanocomposite is synthesized by three simple steps and the optimal photoluminescence quantum yield (PLQY) is 50%. Benefiting from the dual protection of the glass matrix and SEBS film re-encapsulation, the MGS composite shows typical bright green emission, significant improvement in water/ thermal/photon resistance, and environmental friendliness. Moreover, combining the as-prepared red emitter and the green-emitting MGS film with a blue InGaN chip as the backlight, an efficient white light-emitting diode (wLED) for backlights is fabricated. The gamut of the prepared LCD covers 131 and 97.7% National Television System Committee (NTSC) 1953 and Rec. 2020, respectively. In addition, random upconverted laser emission is achieved by low-power two-photon pumping. Hence, the dual-protective composite material with exceptional stability provides a feasible path for backlight display and upconverted lasing.
In
recent years, silicon (Si) photodetectors (PDs) have been widely
used in daily life, but the ultraviolet (UV) region response is extremely
low, while perovskite nanocrystals (NCs) can be used as a light conversion
layer to effectively improve the UV region detection performance due
to their high absorption coefficient. At the same time, embedding
NCs into a glass matrix can protect NCs from the adverse external
environment, which can greatly prolong the effective working time
of the detector. In this work, a series of perovskite NC glasses (PNGs)
with intrinsic emission but still maintaining high transmittance were
fabricated successfully by regulating the concentration of CsPbCl2Br1 NCs. Furthermore, the rare-earth ion Tb3+ was successfully introduced into CsPbCl2Br1 NCs, achieving energy transfer of the exciton to Tb3+, and the photoluminescence quantum yield (PLQY) had a big boost
from 11.1 to 28.1%. In the end, the prepared CsPbCl2Br1:Tb3+ PNG was first integrated with Si PDs, and
the UV responsibility of Si PDs was enhanced due to the absorption
of CsPbCl2Br1 PNG doped with Tb3+ in the UV region. At 320 nm, the responsivity of Tb3+-doped CsPbCl2Br1 PG-Si PDs is significantly
higher than that of bare Si PDs. In addition, CsPbCl2Br1:Tb3+ PNG-Si PDs maintained excellent photocurrent
stability. The CsPbCl2Br1:Tb3+ PNGs
are expected to be one of the optimum semiconductor materials for
next-generation high-performance UV PDs.
This study successfully synthesized stable Cs3Cu2I5 NC glass ceramics with a quantum yield of up to 63.3% by regulating the SnO content. It was ultimately applied in X-ray imaging, producing clear images with a resolution of 9 lp mm−1.
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