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A white light and stable technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of poor stability of perovskite quantum dots, achieve the effects of improving poor stability, avoiding agglomeration, and increasing fluorescence quantum yield
Inactive Publication Date: 2018-01-09
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
[0004] In order to solve the problem of poor stability of perovskite quantum dots prepared by the above technology, the present invention proposes a method for prepar
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Embodiment 1
[0018] Perovskite CsPb(Br / Cl) coated with mesoporous silica with luminous peak wavelength of 480nm 3 Quantum dots, 530nm green mesoporous silica-wrapped perovskite CsPbBr 3 Quantum dots and 630nm red mesoporous silica-wrapped perovskite CsPb(Br / I) 3 Quantum dots are used as the light-emitting layer after mixing, and the ultraviolet chip is used as the excitation light source to obtain a stable white LED.
[0019] The preparation scheme of stable white LED based on mesoporous silica-wrapped perovskite quantum dots is as follows:
[0020] Chemical material: brilliant carbonate (99.9%, CsCO 3 ), oleic acid (90%, OA), octadecene (90%, 1-ODE), lead bromide (PbBr 2 , 99.0%), lead iodide (PbI 2 , 99.0%), lead chloride (PbCl 2 ), n-octylphosphine (TOP, 90%) n-hexane (99.5%) and toluene (99.5%), oleylamine (90.0%, OAM), mesoporous silica (pore size 17.25nm, 14.38nm and 6.08nm The three types), Dow Corning OE6550 potting glue.
[0021] The first step: select the ultraviolet (LED)...
Embodiment 2
[0034] The steps are the same as in the specific example 1, except that the blue-light mesoporous silicon dioxide is used to wrap the perovskite CsPb(Br / Cl) with a peak wavelength of 490 nm. 3 Quantum dots, 550nm green mesoporous silica-wrapped perovskite CsPbBr 3 Quantum dots and 640nm red mesoporous silica-wrapped perovskite CsPb(Br / I) 3 Quantum dots, and "Instant injection of 0.6ml cesium oleate precursor" in the second step "Preparation of Perovskite Quantum Dots".
Embodiment 3
[0036] The steps are the same as in the specific example 1, except that in the third step, the perovskite red light ore quantum dots, green light quantum dots and blue light quantum dots wrapped in mesoporous silica are mixed according to the mass ratio: 3:2:8.
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Abstract
The invention discloses a preparation method of a stable and white-light LED. The preparation method comprises the following steps of selecting an ultraviolet LED chip, and carrying out ultrasonic andultraviolet ozone cleaning treatment; preparing perovskite quantum dots wrapped by the mesoporous silica, and then preparing a quantum dot mixture; placing a light-taking lens on the ultraviolet chip, and filling a silica gel pouring sealant; connecting the prepared LED with an external driving circuit to complete the preparation of the high-stability and white-light LED. According to the invention, the perovskite quantum dots are embedded into the mesoporous silica, so that the quantum dots can be protected against the erosion of water and oxygen. The poor stability problem of the quantum dots is solved. Meanwhile, the influence of the anion exchange reaction on the mixed quantum dots can be avoided, so that obtained mesoporous silica-coated perovskite quantum dots have long-term stability in the air. At the same time, the agglomeration between the quantum dots is avoided. The quantum yield of the quantum yield is improved. The prepared white-light LED has very high luminous efficiency and good stability.
Description
technical field [0001] The invention relates to quantum dot light-emitting diode technology, in particular to a method for preparing a stable white LED based on mesoporous silicon dioxide-wrapped perovskite quantum dots. Background technique [0002] In recent years, white light-emitting diodes have become a high-efficiency, long-life lighting device and occupy an important position in the lighting field due to their low power consumption, long life, fast response time, and compact size. The prospect of white light-emitting diodes in the lighting field has attracted much attention. In recent years, quantum dots have been introduced into white light-emitting diode technology as a member of the phosphor family due to their excellent optical properties such as high quantum yield, narrow emission bandwidth, and tunable emission wavelength in a wide spectral range. Quantum dot phosphors also have the potential to replace traditional phosphors due to their good luminescent color ...
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