Bipolar host organic electroluminescent material and application thereof
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An electroluminescent material, bipolar technology, applied in luminescent materials, organic chemistry, circuits, etc., can solve problems such as single carrier transport properties, spectral instability, unbalanced OLED turn-on voltage and lifespan
Inactive Publication Date: 2018-09-28
VALIANT CO LTD
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[0003] Traditional host materials usually only have a single carrier transport property, and this unbalanced carrier transport property has been shown to be detrimental to the turn-on voltage and lifetime of OLEDs.
The development of new host materials must have good bipolar carrier (hole and electron) injection and transport properties to avoid the accumulation of carriers between the light-emitting layer and the charge-transport layer, causing the exciplexes at the interface to emit light , resulting in low external quantum efficiency, power efficiency, current efficiency and other main parameters of the device, high turn-on voltage, and spectral instability.
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Embodiment 1
[0067] The preparation of embodiment 1 compound C15
[0068]
[0069] Add intermediate M (4.07g, 0.01mol), 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine (4.66g, 0.012mol) to a 250ml three-necked flask successively ), o-xylene (100mL), catalyst Pd(OAc) 2 (45mg, 0.0002mol), tri-tert-butylphosphine tetrafluoroborate (116mg, 0.0004 mol) and potassium tert-butoxide (2.24g, 0.02mol), stirred at 25°C for 10min, and the bath temperature was set at 145-150°C, Reflux and stir the reaction for 16.0 hrs under the protection of nitrogen, TLC monitors the complete reaction of the raw materials and then cools down to 25°C; removes most of the mechanical impurities and salt by suction filtration, washes the filtrate to neutrality, dried the organic phase with anhydrous sodium sulfate, and desolvated the organic phase to obtain Brown-yellow solid; use 1L tetrahydrofuran to heat-dissolve the filter cake and cool it down to room temperature, remove all mechanical impurities by direct column ...
Embodiment 2
[0070] The preparation of embodiment 2 compound C16
[0071]
[0072] Add intermediate N (4.33g, 0.01mol), 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine (4.66g, 0.012mol) to a 250ml three-necked flask successively ), o-xylene (100mL), catalyst Pd(OAc) 2 (45mg, 0.0002mol), tri-tert-butylphosphine tetrafluoroborate (116mg, 0.0004 mol) and potassium tert-butoxide (2.24g, 0.02mol), stirred at 25°C for 10min, and the bath temperature was set at 145-150°C, Reflux and stir the reaction for 16.0 hrs under the protection of nitrogen, TLC monitors the complete reaction of the raw materials and then cools down to 25°C; removes most of the mechanical impurities and salt by suction filtration, washes the filtrate to neutrality, dried the organic phase with anhydrous sodium sulfate, and desolvated the organic phase to obtain Brown-yellow solid; use 1L tetrahydrofuran to dissolve the filter cake and cool it down to room temperature, remove all mechanical impurities by direct column chrom...
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Abstract
The invention belongs to the field of organic electroluminescence, and specifically relates to a bipolar host organic electroluminescent material and an application thereof. The bipolar host organic electroluminescent material provided by the invention has high current carrier injection and transport capabilities and good hole and electron transporting bipolar characteristic, so an organic electroluminescent device prepared by using the bipolar host organic electroluminescent material provided by the invention has the advantages of low starting voltage, high luminous efficiency, etc.; the bipolar host organic electroluminescent material has large molecular weight, high glass transition temperature and thermal decomposition temperature and high compound stability, and is favorable for significantly improving the service life of a device; the bipolar host organic electroluminescent material has high singlet and triplet energy levels and can be preferably used as a green light host material; and the device prepared by using the bipolar host organic electroluminescent material provided by the invention as a host material can effectively improve external quantum efficiency, power efficiency and current efficiency.
Description
technical field [0001] The invention belongs to the field of organic electroluminescence, and in particular relates to an organic electroluminescence material with bipolar main body and its application. Background technique [0002] Phosphorescent materials can make full use of the triplet excitons produced by electron-hole recombination in electroluminescent devices, which account for 75% of the ratio. Exciton utilization rate reaches 100%. Phosphorescent materials are usually doped as guest materials in the host material. An effective host material should have an ideal band gap for efficient energy transfer to the guest, and good carrier transport properties for balanced recombination of carriers in the emissive layer. , energy level matching with adjacent layers for efficient charge injection, sufficient thermal and morphological stability for extended device lifetime, and thus the development of host materials is extremely important for high-efficiency electrophosphores...
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