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Core-shell nanostructures comprising zinc halides and zinc carboxylates bound to surface

A nanostructure, zinc carboxylate technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problem of reducing the quantum yield of InPQD

Pending Publication Date: 2022-04-12
SHOEI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a thicker ZnSe shell reduces the quantum yield (QY) of InP QDs, which means that ZnSe or gradient ZnSeS in the buffer layer does not minimize lattice mismatch and lattice strain

Method used

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  • Core-shell nanostructures comprising zinc halides and zinc carboxylates bound to surface
  • Core-shell nanostructures comprising zinc halides and zinc carboxylates bound to surface
  • Core-shell nanostructures comprising zinc halides and zinc carboxylates bound to surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] Preparation of InP / ZnSe Green Luminescent Nanostructures

[0211] InP / ZnSe green-emitting nanostructures were prepared using the following method.

[0212] Weigh out 28.2895 grams of zinc oleate and 8.0631 grams of lauric acid.

[0213] Zinc oleate and lauric acid were added to a 3-neck round bottom flask, and 79.65 mL of 1-octadecene (ODE) and a stir bar were added to the flask.

[0214] Equip the flask with a rubber septum, a thermocouple adapter with a thermocouple, and a Schlenk adapter, and connect the flask to a Schlenk line.

[0215] The solution was carefully degassed with vigorous stirring at room temperature.

[0216] The flask was placed under nitrogen flow from a Schlenk line.

[0217] The flask was lowered into a heating mantle and the solution was heated to about 90°C under nitrogen flow.

[0218] After a clear, colorless solution was obtained, the flask was carefully evacuated for several minutes with vigorous stirring.

[0219] The flask was placed ...

Embodiment 2

[0228] Surface Treatment of InP / ZnSe Green Luminescent Nanostructures

[0229] After the reaction mixture obtained in Example 1 had cooled to room temperature, the rubber septum was quickly removed and 4.36 grams of zinc acetate dihydrate and 3 grams of zinc fluoride were added to the flask. Quick-change rubber septa.

[0230] The flask was returned to the heating mantle and heated to 250°C. This temperature was maintained for 2 hours.

[0231] After 2 hours, the flask was cooled to 100°C.

[0232] Once the flask had cooled to about 100°C, 34 mL of TOP was added using a syringe prepared in the glove box.

[0233] The flask was then carefully evacuated, sealed with a Schlenk adapter, and transferred to the glove box along with several Teflon bottles.

[0234] Undissolved material was pelleted by centrifugation at 5000 rpm for 30 minutes at room temperature. Hexane and EtOH were added to the clear solution, and the suspension was centrifuged at 4000 rpm for 15 minutes. Thi...

Embodiment 3

[0236] Characterization of surface-treated nano-green light-emitting nanostructures

[0237] Fabrication of QLED devices for testing the surface-treated core / shell nanostructures. The device is composed of an ITO-coated glass substrate, a hole-injection layer (HIL) containing PEDOT-PSS, a hole-transport layer, a nanostructured layer in anhydrous octane, an ETL layer (ZnMgO), and a cathode layer (Al )composition. Table 1 shows the results of test devices containing InP / ZnSe / ZnS, InP / ZnSe, InP / ZnSe with surface treatment condition 1 and InP / ZnSe with surface treatment condition 2 in the nanostructure layer.

[0238] Table 1

[0239]

[0240] Condition 1 treatment was treated with zinc fluoride and zinc acetate for 2 hours.

[0241] Condition 2 treatment was treated with zinc fluoride and zinc acetate for 10 hours.

[0242] As can be seen from Table 1, the QY and FWHM of the InP / ZnSe core-shell nanostructures are 58.5% and 53.8 nm, which are lower than the observed InP / ZnS...

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Abstract

The invention belongs to the field of nanostructure synthesis. The present invention provides a highly luminescent core / shell nanostructure having zinc fluoride and zinc acetate bonded to the surface thereof. The invention also provides methods of making the nanostructures, films comprising the nanostructures, and devices comprising the nanostructures.

Description

technical field [0001] The invention belongs to the field of nanostructure synthesis. The present invention provides highly luminescent nanostructures that have been surface treated with zinc acetate and zinc fluoride. The present invention also provides methods of making nanostructures, films comprising nanostructures, and devices comprising nanostructures. Background technique [0002] Due to its stable shell, good energy level alignment, and less lattice mismatch between core and shell and layers, ZnS has been widely used as the shell material in quantum dot (QD) light-emitting diodes based on Cd core QDs. Device performance has improved over the past decade by varying the shell composition and thickness (eg, Cd(core) / ZnS(shell)). Despite promising prospects, the commercialization of QLEDs containing cadmium QDs is severely restricted because cadmium is considered a hazardous substance. [0003] Among the potential alternatives to Cd-based II–VI compounds, InP QDs are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70C09K11/88C09K11/56C09K11/02H01L29/06H01L33/06H01L33/50
CPCC09K11/565C09K11/883C09K11/70C09K11/703C09K11/025H01L33/06H01L33/502C08J5/18C08K9/02C08K9/04H01L29/0665
Inventor D·金W·郭A·涂Y·A·乔D·巴雷拉C·伊彭B·纽梅耶尔马瑞青
Owner SHOEI CHEM IND CO LTD