Spirofluorene triphenylamine derivatives and their applications in organic electroluminescent devices
An organic light-emitting layer and electroluminescence technology, applied in the fields of electric solid devices, organic chemistry, light-emitting materials, etc., can solve the problems of spectral impurity, low voltage, low blue light efficiency, etc., and achieve high carrier mobility and driving voltage. The effect of small, high triplet energy levels
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Embodiment 1
[0048] The compound shown in formula (1), its structural formula is as follows:
[0049]
[0050] The reaction scheme and concrete preparation method of the compound shown in formula (1) are as follows:
[0051]
[0052] (1) Under the protection of argon, 2-bromodibenzothiophene and 1-fluorenoneboronic acid (0.69 g, 2.4 mmol) were mixed in 60 mL of tetrahydrofuran (THF) solvent. Add catalyst Pd(PPh 3 ) 4 , to obtain a mixed solution. After heating the mixed solution at 50 °C for 10 min, a concentration of 2M K was added 2 CO 3 Aqueous solution 15mL. The reaction time is 12 hours, and the reaction temperature is 50 degrees Celsius. Wait for the temperature of the mixed liquid to drop to room temperature, remove THF under vacuum, add 100 mL of dichloromethane to the residual solid, then add 100 mL of water to wash, repeat 3 times, and finally remove water under vacuum. The obtained residue was purified by silica gel column, eluting with petroleum ether / dichlorometha...
Embodiment 2
[0064] Utilize the synthetic compound SPIRO-SO2-TPA of embodiment 1 to prepare electroluminescent device, its structure is as follows figure 2 As shown, a glass substrate 1, an anode layer 2, a hole injection layer 3, a hole transport layer 4, an electron blocking layer 5, an organic light-emitting layer 6, a hole blocking layer 7, and an electron transport layer are sequentially arranged from bottom to top. 8. The electron injection layer 9 and the cathode layer 10 are composed. The preparation steps of the above electroluminescent device are as follows:
[0065] Step 1: After the patterned ITO conductive glass substrate 1 is repeatedly ultrasonicated three times in an ultrasonic machine with acetone and ethanol, it is baked in an oven at 100°C until dry and ready for use. ITO serves as the anode layer 2 .
[0066] Step 2: Place the ITO conductive glass substrate 1 in the vacuum chamber with ozone for 15 minutes, and evacuate to 4.0×10 -4 Pa or so.
[0067] Step 3: On th...
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