TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic palladium catalyst used is tetrakis(triphenylphosphine)palladium(0), (1,1-bis(diphenylphosphino)ferrocene)dichloropalladium(II) or palladium acetate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I) comprises: (i) adding 2-bromo-7-iodospiro(fluorene-9,9'-xanthene), amine compounds of formula (R1-H) (A) and weak base in a dried weak polar solvent and stirring at room temperature for a certain time; (ii) adding organic palladium catalyst and an organic phosphine catalyst to dried weak polar solvent and stirring; (ii) mixing the solution obtained in step (i) and (ii) under stirring and refluxing; (iv) cooling to room temperature, extracting, washing with water, drying, filtering, evaporating, performing column chromatography by using eluent, isolating and purifying to obtain substituted 2-bromo-spiro(fluorene-9,9'-xanthene) (III); (v) adding (III), strong base and amine compounds of formula (R2-H) (B) to dried weak polar solvent, and stirring at room temperature for a certain time; (vi) adding organic palladium catalyst and an organic phosphine catalyst to dried weak polar solvent and stirring; (vii) mixing the solution obtained in step (v) and (vi) under stirring and refluxing; and (viii) cooling to room temperature, extracting, washing with water, drying, filtering, evaporating, performing column chromatography by using eluent, isolating and purifying to obtain (I). Preferred Components: The weak base is potassium carbonate or sodium hydroxide. The weak polar solvent is toluene, tetrahydrofuran, dimethylformamide, dimethylsulfoxide and/or dimethylacetamide. The organic phosphine catalyst is trimethyl phosphine, triphenyl phosphine, tri-tert-butylphosphine. The strong base is sodium tert-butoxide, potassium tert-butoxide, sodium ethoxide, potassium ethoxide, sodium n-butoxide or potassium-n-butoxide. The eluent is mixture of cyclohexane and petroleum ether. The molar ratio of weak base to (II) is 1:1-2:1. The molar ratio of (A) to (II) is 0.8:1-1:1. The molar ratio of strong base to (III) is 1:1-2:1. The molar ratio of (B) to (III) is 0.8:1-1.2:1. In the step (i) and step (v), the stirring time is 5 minutes-10 hours. In the step (iii) and step (vii), refluxing time is 5-20 hours. (I) emits blue light. Preferred Definitions:    R1, R2 = N-(3-methylphenyl)anilino, di(p-tolyl)amino, bis(4-tert-butylphenyl)amino, N-phenylnaphthalen-2-amino, N-phenylnaphthalen-1-amino, pyrrolyl, 2,4-dimethyl-pyrrolyl, indolyl, 2-phenyl-indolyl, carbazolyl, 3-methyl-carbazolyl, 3,6-dimethyl-carbazolyl, benzo(b)carbazolyl, 10-methyl-benzo(c)carbazolyl, benzo(a)carbazolyl, benzoimidazol-1-yl, 5,6-dimethyl-benzoimidazol-1-yl, 5-methyl-benzoimidazol-1-yl, 2-methyl-benzoimidazol-1-yl or 2-benzyl-benzoimidazol-1-yl.