Method for growing red-light octagonal leadless two-dimensional perovskite monocrystals

A growth method, perovskite technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of single crystal performance difference, etc., and achieve the effect of green growth process, strong practical value, and controllable growth method

Active Publication Date: 2019-08-20
SHANDONG UNIV OF SCI & TECH
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Finally, the performance of single crystals obtained by different single crystal preparation methods will be different

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for growing red-light octagonal leadless two-dimensional perovskite monocrystals
  • Method for growing red-light octagonal leadless two-dimensional perovskite monocrystals
  • Method for growing red-light octagonal leadless two-dimensional perovskite monocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Dissolve manganese chloride and methylamine chloride in a molar ratio of 1:2 in a mixed organic solution (DMSO and DMF) at room temperature to obtain a mixed solution with a concentration of 0.8 mol / L. After the solution was fully stirred evenly, the obtained colorless and transparent solution was sealed and transferred to a temperature of 90° C. to start crystal growth. After about 10-15 days, a two-dimensional layered perovskite (CH 3 NH 3 ) 2 MnCl 4 Luminescent single crystal, single crystal size is about 9mm. Then the single crystal was put into and dissolved in hydrochloric acid solution, so that the concentration of the mixed solution was 0.8 mol / L. After the solution was fully stirred evenly, the obtained yellow transparent solution was sealed, and transferred to 60° C. to start crystal growth. After about 10-15 days, the red two-dimensional layered perovskite (CH 3 NH 3 ) 2 MnCl 4 Luminescent single crystal, single crystal size is about 9mm.

[0045] ...

Embodiment 2

[0049] The crystals grown in Example 1 were packaged with LED devices by the following method. The crystal is mixed with PDMS to obtain a colloid with an appropriate viscosity, and then the vacuum defoaming process is used to remove the air in the colloid, which has improved the light transmittance of the colloid. Select a suitable chip (the emission spectrum range is between 410 and 420 nm) that has been welded with gold wires, and then coat the colloid on the chip to obtain an LED light emitting device. The above-mentioned device was put into an oven, and the colloid was cured at 50° C. for 2 hours to obtain the final LED light-emitting device.

[0050] A certain voltage is applied to the device obtained in the embodiment, and the spectrum of the device is as Figure 10 shown. The spectrum indicates that the octagonal red-emitting two-dimensional layered perovskite (CH 3 NH 3 ) 2 MnCl 4 The luminous single crystal absorbs the violet light chip better, and can be used f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for growing monocrystals, and especially relates to a method for growing red-light octagonal leadless two-dimensional perovskite monocrystals. The monocrystals are (CH3NH3)2MnCl4 concretely, and the method for growing the red-light octagonal leadless two-dimensional perovskite monocrystals is a double-crystallization transformation technology. The double-crystallization transformation technolog comprises the following two steps: A) manganese chloride (MnCl2), methylamine chloride (CH3NH3Cl) and a solution system composed of dimethyl sulfoxide (DMSO) and N,N-dimethylformamide (DMF) in proportion is slowly crystallized to obtain square red-light (CH3NH3)2MnCl4 leadless two-dimensional perovskite monocrystals; and B) the square red-light leadless two-dimensional perovskite monocrystals obtained in step A) are placed in a hydrochloric acid solution with a concentration of 36-38%, and the obtained solution is slowly crystallized to obtain the octagonal (CH3NH3)2MnCl4 leadless two-dimensional perovskite monocrystals. The (CH3NH3)2MnCl4 leadless two-dimensional perovskite monocrystals have the advantages of great exciton binding energy, good luminescence property and high stability, and especially are of great significance to develop luminescent materials and apply the materials in LEDs.

Description

technical field [0001] The invention relates to a method for growing a single crystal, in particular to a method for growing an octagonal red light lead-free two-dimensional perovskite single crystal. Background technique [0002] First of all, LED lighting is currently the most popular lighting technology. The feature of this technology is to use a blue light chip to excite phosphors of different luminescent colors, and the light emitted by the phosphors is combined with the unabsorbed blue light to obtain the required spectrum. There is a lack of red light materials in LED fluorescent materials, and the current commercial products include nitride Sr 0.9 Ca 0.1 AlSiN 3 :Eu 2+ and fluoride K 2 SiF 6 :Mn 4+ Wait. The synthesis of nitrides is extremely difficult and requires extremely high temperature and pressure, while fluorides have certain environmental toxicity and poor water resistance. [0003] Secondly, organic-inorganic hybrid halide perovskite materials have...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C30B29/54C30B29/64C07F13/00C09K11/06C30B7/14
CPCC07B2200/13C07F13/005C09K11/06C09K2211/188C30B7/14C30B29/54C30B29/64
Inventor丁建旭
OwnerSHANDONG UNIV OF SCI & TECH