This work demonstrated color-conversion layers of red and green quantum dots color filter for full-color display arrays. Ligands exchange using (3-glycidyloxypropyl) trimethoxysilane with epoxy functional groups to treat QDs in the liquid phase was performed for photolithography use. The combination of ligands of QDs with photo-initiator played a protective role on QDs. Moreover, the pixel size of green QDCF can be reduced to 50 μm, and a high optical density (OD) of 1.2 is realized.
Materials with circularly polarized luminescence (CPL)
activity
are promising in many chiroptoelectronics fields, such as for biological
probes, asymmetric photosynthesis, information storage, spintronic
devices, and so on. Promoting the value of the dissymmetry factor
(g
lum) for the CPL-active materials based
on chiral perovskite draws increasing attention since a higher g
lum value indicates better CPL. In this work,
we find that, after being treated with a facile solvent modulation
strategy, the chirality of 2D chiral perovskite films has been enhanced
a lot, which we attribute to an increased lattice distortion degree.
By forming chiral perovskite/quantum dot (QD) composites, the CPL-active
material is successfully obtained. The calculated maximum |g
lum| of these composites increased over 4 times
after solvent modulation treatment (1.53 × 10–3 for the pristine sample of R-DMF and 6.91 ×
10–3 for R-NMP) at room temperature.
Moreover, the enhancement of the CPL intensity is ascribed to two
aspects: one is the generation and transportation of spin-polarized
charge carriers from chiral perovskite films to combine in the QD
layer, and the other is the solvent modulation strategy to enlarge
the lattice distortion of chiral perovskite films. This facile route
provides an effective way to construct CPL-active materials. More
importantly, this kind of composite material (chiral perovskite film/QD
layer) can be easily applied for fabricating circularly polarized
light-emitting diode devices for electroluminescence.
Enhanced and balanced carrier injection is essential to achieve highly efficient green indium phosphide (InP) quantum dot light-emitting diodes (QLEDs). However, due to the poor injection of hole in green...
Double perovskites Cs2Na1-xAgxIn1-yBiyCl6 can emit warm white light with almost unit quantum efficiency and are thus among the most promising materials for solid-state lighting. The emission spectrum is reproducible and...
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