Use of coordination polymer as electron transport material
An electron transport material, electron transport layer technology, applied in the direction of light-emitting materials, circuits, electrical components, etc., can solve the cumbersome process, it is difficult to meet the requirements of electron transport materials, and the molar content of 8-hydroxyquinoline aluminum is difficult to exceed 20% and other problems, to achieve the effect of good thermal stability and low start-up voltage
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Embodiment 1
[0036] Dissolve analytically pure 8-hydroxyquinoline in absolute ethanol, add NaOH solution, mix well and cool, then add chloroform dropwise. After the chloroform was added dropwise, the temperature was raised and the reaction was stirred and refluxed. Evaporate excess chloroform and ethanol on a rotary evaporator, dissolve the remaining residue in deionized water, adjust the pH value to 5-6 with dilute hydrochloric acid, a precipitate is formed, filter it with suction and dry it in an oven. Grind the dried solid into powder, extract it with petroleum ether in a fat extractor, cool the extract, collect the precipitate by filtration, and recrystallize it with absolute ethanol. 5-Formyl-8-hydroxyquinoline is obtained. For mass spectrometric characterization results, see image 3 . Add 5-formyl-8-hydroxyquinoline and 3,5-diaminobenzoic acid to toluene and heat to reflux. The resulting product was filtered while hot. , to obtain 3,5-bis(8-hydroxyquinoline)-benzoic acid. Prot...
Embodiment 2
[0038] The HOMO / LUMO energy levels of 8-hydroxyquinoline aluminum coordination polymers were determined by cyclic voltammetry on a three-electrode system. Immerse the platinum wire in the ethanol solution of 8-hydroxyquinoline aluminum coordination polymer, take it out and dry it in an oven at 75°C for one hour, and use this platinum wire as the working electrode. At the same time, an Ag / AgCl electrode was used as a reference electrode, and a platinum sheet was used as a counter electrode. The test was carried out in dichloromethane solution with 4-methylammonium perchlorate as the supporting electrolyte. From the cyclic voltammetry sweep curve (see Figure 7 ) we obtained its initial reduction potential as -0.38V, calculated its LUMO energy level as -4.02eV, and obtained its HOMO energy level through its LUMO energy level and the energy gap obtained from the ultraviolet-visible absorption dotted line as - 6.38eV.
Embodiment 3
[0040] A device with a sandwich structure (ITO / electron transport material / Al) was prepared. Among them, ITO is an indium tin oxide glass substrate, and the electron transport material is 8-hydroxyquinoline aluminum coordination polymer or 8-hydroxyquinoline aluminum. Measure the current-voltage curves of the two devices (see Figure 8 ). It can be found that the starting voltage (about 1.0V) of the device using 8-hydroxyquinoline aluminum coordination polymer as the electron transport material is significantly lower than that of using 8-hydroxyquinoline aluminum as the electron transport material device (about 4.5V ).
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