Organic electroluminescent device

An electroluminescent device, an organic technology, applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of low luminous efficiency of light-emitting devices, low recombination efficiency of electrons and holes, and unbalanced carrier injection. To achieve the effect of improving luminous efficiency and service life, avoiding heat accumulation and avoiding imbalance

Inactive Publication Date: 2018-11-30
CHANGCHUN HYPERIONS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, traditional OLED display devices often have problems with luminous efficiency and service life. The main reasons are as follows: on the one hand, it depends on the luminous performance of the organic light-emitting materials used, and the matching degree between the composite materials of each layer; on the other hand, it depends on Exciton utilization, due to the different transport speeds of holes and electrons in organic optoelectronic materials, conventional device structures are prone to the problem of unbalanced carrier injection, resulting in low recombination efficiency of electrons and holes and shifts in the recombination area, thus Lead to low luminous efficiency and low lifespan of organic electroluminescent devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Embodiment 1: the synthesis of compound 1-A6

[0119]

[0120] Synthesis of intermediate a1-6

[0121] Tri-tert-butylphosphine (4.4 mL of a 1.0 M solution in toluene, 1.48 g, 0.05 mmol), palladium acetate (0.4 g, 1.83 mmol) and sodium tert-butoxide (22.8 g, 238 mmol) were added to N,N'- A solution of diphenylbenzidine (61.5 g, 183 mmol) and 3-bromo-9,9-dimethylfluorene (49.9 g, 183 mmol) in degassed toluene (1 L), and the mixture was heated at reflux for 2 Hour. The reaction mixture was cooled to room temperature, diluted with toluene and filtered through celite. The filtrate was diluted with water and extracted with toluene, and the combined organic phases were evaporated under vacuum. The residue was filtered through silica gel and recrystallized. Intermediate a1-6 (77.3 g, 80% yield) was obtained.

[0122] Mass Spectrum m / z: 528.63 (calculated: 528.68). Theoretical element content (%)C 39 h 32 N 2 : C, 88.60; H, 6.10; N, 5.30 The measured element content ...

Embodiment 2

[0135] Embodiment 2: the synthesis of compound 1-A17

[0136]

[0137] Replace N,N'-diphenylbenzidine in Example 1 with equimolar N,N'-diphenylbenzidinediamine, and 3-bromo-9,9-dimethylfluorene with equimolar 2-bromo-dibenzofuran, other steps are the same as the synthesis of Example 1 to obtain the target product compound 1-A17. Mass Spectrum m / z: 816.93 (calculated: 816.98). Theoretical element content (%)C 61 h 40 N 2 O: C, 89.68; H, 4.93; N, 3.43; O, 1.96 Measured element content (%): C, 89.67; H, 4.94; N, 3.41; O, 1.98. The above results confirmed that the obtained product was the target product.

Embodiment 3

[0138] Embodiment 3: the synthesis of compound 1-A38

[0139]

[0140] The N,N'-diphenylbenzidine in Example 1 was replaced with an equimolar compound A, and the other steps were the same as in Example 1 to obtain the target compound 1-A38. Mass Spectrum m / z: 883.26 (calculated: 883.13). Theoretical element content (%)C 67 h 50 N 2 : C, 91.12; H, 5.71; N, 3.17 Measured element content (%): C, 91.13; H, 5.72; N, 3.15. The above results confirmed that the obtained product was the target product.

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Abstract

The invention provides an organic electroluminescent device, and relates to the technical field of organic photoelectricity. According to the organic luminescent device, a hole transport layer comprises a first compound represented by a formula (1), and an electron transport layer comprises a second compound represented by a formula (2). The first compound is a compound formed by combining an aromatic amine structure with a fluorene class group, and a malleable conjugated system obtains better carrier transmission performance. The second compound is a compound formed by connecting benzimidazole groups with aza-carbazole groups, and a continuous pi conjugated system brings better electron flow ability, so that high electron mobility is achieved. The first compound and the second compound are applied to the organic electroluminescent device, the transmission rate of electrons and holes is balanced, the generation rate and utilization rate of excitons in a luminescent layer are improved,the turn-on voltage of the device is reduced, and the luminescent efficiency of the device is improved.

Description

technical field [0001] The invention relates to the field of organic photoelectric technology, in particular to an organic electroluminescent device. Background technique [0002] In recent years, Organic Light Emitting Diode (OLED: Organic Light Emitting Diode) as a new and promising display technology has gradually entered people's field of vision. Compared with traditional display technologies, it has significant advantages in voltage characteristics, luminous brightness, luminous efficiency, device weight, response speed, and viewing angle, and has broad market prospects due to its low-cost potential. [0003] Typically, OLEDs have a layered or laminated structure. For example, a typical OLED has an anode / organic light-emitting layer / cathode multilayer structure. OLEDs can also have various other structures such as anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode multilayer structure or anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/615H10K85/631H10K50/15H10K50/16
Inventor 刘喜庆蔡辉
Owner CHANGCHUN HYPERIONS TECH CO LTD
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