Perovskite light-emitting diode and preparation method thereof
A technology of light-emitting diodes and perovskites, which is applied in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., and can solve problems such as difficult to determine the dripping time of the anti-solvent step
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[0066] Figure 5 It is a schematic diagram of the preparation process of the perovskite light-emitting layer of the present invention. During the spin coating process, a 365nm ultraviolet lamp is placed above the spin coating apparatus. The temporal and spatial nucleation and crystallization kinetics of perovskite can be easily identified by observing the photoluminescence phenomenon of the spin-coated thin film under the excitation of ultraviolet light.
[0067] At the beginning of the spin-coating process, the liquid perovskite film contains a large amount of dimethyl sulfoxide (DMSO) solvent, which does not reach supersaturation and no photoluminescence occurs (steps 1 and 2). After evaporation and removal of excess solvent, the formation of supersaturation leads to nucleation and some degree of crystallization of the film at the edge of the substrate, at which point the onset of photoluminescence can be monitored (steps 3 and 4). It is defined as the critical time for the...
no. 1 example
[0092] Based on the first embodiment, the second embodiment of the preparation method of the perovskite light-emitting diode of the present invention is proposed. In this embodiment, the preparation process of the green light perovskite light-emitting diode is proposed as follows, which specifically includes:
[0093] (1) First use laser etching process to carry out pattern design on ITO substrate;
[0094] (2) Use deionized water, lye, isopropanol solution and ethanol solution to carry out ultrasonic cleaning on the ITO substrate layer respectively for 15-30min, then blow dry and put it in a drying box for drying;
[0095] (3) UV ozone pretreatment is carried out to the dried ITO glass substrate;
[0096] (4) PEDOT:PSS (4083) solution and ethanolamine solution are mixed by volume ratio to obtain hole layer precursor solution;
[0097] (5) Spin-coat the hole transport layer precursor solution at a speed of 3000-7000rpm for 30-100s on the ITO glass substrate treated in step (3),...
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