Compound, preparation method thereof and organic light emitting display device

1. A compound, having a structure expressed by formula (I),

wherein, R 1 is any one selected from halogen, —CF 3 , —NO 2 , —CN, phenyl, biphenyl, naphthyl, fluorenyl, triazinyl, triazolyl, tetrazolyl, benzimidazolyl, benzoxazolyl, dibenzothiophene sulfonyl, dibenzothiophenyl, pyridyl, pyrimidyl, quinolyl, isoquinolyl, substituted phenyl, substituted biphenyl, substituted naphthyl, substituted anthryl, substituted phenanthryl, substituted cyclopenta[def]phenanthryl, substituted fluorenyl, substituted spirofluorenyl, substituted pyrenyl, substituted triphenylene group, substituted fluoranthenyl, substituted indenofluorenyl, substituted benzofluorenyl, substituted indenanthracenyl, substituted dibenzofluorenyl, substituted naphthanthracenyl, substituted benzanthracenyl, substituted triazinyl, substituted triazolyl, substituted benzimidazolyl, substituted carbazolyl, substituted pyridyl, substituted pyrimidyl, substituted quinolyl, substituted isoquinolyl, substituted benzothiazolyl, substituted benzoxazolyl, substituted dibenzothiophenyl, substituted dibenzothiophene sulfonyl, substituted dibenzofuryl, substituted phenoxazinyl and substituted phenothiazinyl;

R 2 is any one selected from a C1 to C20 linear or branched alkyl group and a C1 to C20 linear or branched alkoxy group; and

wherein substituent groups among the substituted phenyl, substituted biphenyl, substituted naphthyl, substituted anthryl, substituted phenanthryl, substituted cyclopenta[def]phenanthryl, substituted fluorenyl, substituted spirofluorenyl, substituted pyrenyl, substituted triphenylene group, substituted fluoranthenyl, substituted indenofluorenyl, substituted benzofluorenyl, substituted indenanthracenyl, substituted dibenzofluorenyl, substituted naphthanthracenyl, substituted benzanthracenyl, substituted triazinyl, substituted triazolyl, substituted benzimidazolyl, substituted carbazolyl, substituted pyridyl, substituted pyrimidyl, substituted quinolyl, substituted isoquinolyl, substituted benzothiazolyl, substituted benzoxazolyl, substituted dibenzothiophenyl, substituted dibenzothiophene sulfonyl, substituted dibenzofuryl, substituted phenoxazinyl and substituted phenothiazinyl, are selected from electron withdrawing groups.

2. The compound according to claim 1 , wherein R 2 is any one selected from a C1 to C8 linear or branched alkyl group and a C1 to C8 linear or branched alkoxy group.

3. The compound according to claim 1 , wherein R 1 is any one selected from the group consisting of:

and —CN, in which a, b and c are respectively an integer independently selected from 1 to 5.

4. The compound according to claim 1 , wherein the compound is expressed by formula (II),

5. A preparation method of the compound according to claim 1 , comprising:

obtaining the compound expressed by formula (I) through a condensation reaction of a compound expressed by formula (III) and a compound expressed by formula (IV),

wherein X is any one selected from halogen.

6. The preparation method according to claim 5 , wherein truxenone is prepared by using a raw material of 1,3-indandione, and the compound expressed by formula (III) is obtained through a substitution reaction with the truxenone as a reactant.

7. An organic light emitting display device, comprising an organic electroluminescent device comprising:

an organic functional layer, comprising one or more organic film layers, wherein at least one of the organic film layers is a light emitting layer;

the light emitting layer comprises a light emitting material, and the light emitting material comprises the compound according to claim 1 .

8. The organic light emitting display device according to claim 7 , wherein the organic electroluminescent device further comprises:

a base;

a first electrode arranged on the base; and

a second electrode arranged on the organic functional layer, wherein the organic functional layer is arranged on the first electrode.

9. The organic light emitting display device according to claim 7 , wherein the light emitting material is a blue thermally activated delayed fluorescence material.

10. The organic light emitting display device according to claim 7 , wherein the light emitting material is a host material or a guest material of the light emitting layer.

11. The organic light emitting display device according to claim 7 , wherein the organic electroluminescent device is manufactured using a solution processing method.

12. The organic light emitting display device according to claim 11 , wherein the solution processing method is selected from an ink-jet printing method.