Bipolar organic single crystal grown by molecular blending, preparation method and application thereof
A bipolar and organic technology, applied in the field of optoelectronics, can solve problems such as the difficulty of preparing organic single crystal heterojunctions, achieve the effects of simplifying device structure and processing technology, balancing charge transport, and improving luminescent performance
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Embodiment 1
[0034] The method for growing a bipolar organic single crystal by molecular blending, the specific steps are as follows:
[0035] First, mix the p-type material and n-type material powder according to a certain mass ratio, put them in a mortar, add an organic solvent, grind the mixture thoroughly for 10-30 minutes, dry it in an oven to remove the solvent, and obtain a uniformly mixed material powder; then, place the uniformly mixed powder in the high-temperature sublimation zone of the dual-temperature zone tube furnace; finally, pass a carrier gas with a stable flow rate into the tube furnace, set the respective temperature and growth time of the two temperature zones, and start Heating, using the physical vapor transport method (PVT) to grow flake-shaped bipolar single crystals suspended on the wall of the quartz tube.
[0036] The p-type material is 1,4-bis(4-methylstyryl)benzene (BSB-Me), and the n-type material is 2,2'-bis[4-(trifluoromethyl)phenyl]- 5,5'thiazole (BTPB),...
Embodiment 2
[0038] 1. A method for preparing an OFET device using a bipolar organic single crystal grown by molecular blending, the specific steps are as follows:
[0039] (1) Substrate preparation;
[0040] First, the Si / SiO 2 Substrate (single-sided SiO 2 ) were ultrasonically cleaned with acetone, ethanol and deionized water in sequence for 30 minutes, dried with nitrogen and placed in a petri dish. The petri dish was placed in an oven at 95°C for 8 minutes; then, the substrate was placed in plasma In the vacuum chamber of the plasma cleaning machine, a stable oxygen flow is introduced at a flow rate of 30ml / min, and the treatment is performed for 10 minutes to obtain a substrate with hydrophilic modification;
[0041] (2) Blending and growing bipolar organic single crystals;
[0042] First, the p-type BSB-Me and n-type BTPB material powders were mixed in a certain mass ratio and then placed in a mortar. The mixing mass ratios of the two were 100:2, 100:5 and 100:10, respectively. ...
Embodiment 3
[0047] Fabrication of OLED devices from bipolar organic single crystals grown by molecular blending.
[0048] The commercial p-type organic single crystal material BSB-Me with low defect density and high fluorescence quantum efficiency and the n-type organic single crystal material BTPB with high electron mobility and high stability are selected, and the controllable blending growth of the two is used to prepare charge Transport-balanced bipolar organic single crystals. Furthermore, the bipolar organic single crystal is used as the light-emitting layer of the OLED device. The balanced charge transport inside the bipolar organic single crystal effectively confines the excitons in the light-emitting layer to improve the recombination luminous efficiency, and finally effectively improves the efficiency of the organic single crystal OLED. Luminous efficiency.
[0049] The OLED device is prepared by using the bipolar organic single crystal grown by molecular blending, and the spec...
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