Perovskite
light-emitting diode (PeLED) has been vigorously developed
in recent years. As it has demonstrated good performance on the rigid
substrates, the next important direction of PeLED is its integration
with stretchable components to realize stretchable, responsive device.
Here, we describe a facile fabrication of stretchable perovskite light-emissive
touch-responsive devices (PeLETDs) by utilizing highly transparent
and conductive polyurethane/silver nanowires (PU/AgNWs) as the electrode.
Meanwhile, a stretchable tricomposite perovskite emissive layer was
developed by blending a small amount of poly(ethylene oxide) (PEO)
and poly(vinylpyrrolidone) (PVP) with CsPbBr3. Additionally,
a thin PVP layer was introduced at the bottom of the emissive layer.
On one hand, it can further improve the morphology of the emissive
layer; on the other hand, it can serve as an electron-injection barrier
to reduce the high nonradiative recombination at the corresponding
interface. Further, to fulfill the responsive function of the fabricated
PeLEDs, a poly(ethylene terephthalate) (PET) spacer with a 100 μm
thickness was inserted between the top electrode and the emissive
layer. A stretchable PeLETD is finally demonstrated to possess a low
turn-on voltage of 2 V with a brightness of 380.5 cd m–2 at 7.5 V and can sustain 30% uniaxial strain with a small luminance
variation of 24%. More interestingly, our stretchable PeLETD exhibited
high stability, which could be well touch responsivity, where the
luminance is on/off switched for 300 cycles by repeatedly applying
pressure.
This study developed a novel type of normalization procedure for modulation reflectance spectroscopy experiments to obtain the relative change in the reflectance spectrum, ΔR/R. This technique uses a polymer-dispersed liquid crystal to ensure that the dc component of the signal from the detector remained constant by varying the intensity of the light striking the sample. This method is particularly useful for photoreflectance measurement, which may encounter background problems because of scattered pump light and/or photoluminescence. It does not require a change in the gain of the detector or the use of a variable neutral density filter mounted on a servo-motor.
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