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Preparation method of ultra-low turn-on voltage deep blue light organic electroluminescent device

A lighting-on voltage and luminescence technology, which is applied in the fields of electrical solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of complicated process and expensive preparation cost, achieve simple preparation process, increase fluorescence intensity, improve color The effect of purity

Pending Publication Date: 2021-12-17
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the current commercialized OLEDs all use small molecule materials and prepare devices by vacuum thermal evaporation. This preparation process can precisely control the film thickness and deposition rate, but the material usage rate is only 5%, and the preparation cost is expensive. , complex process

Method used

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  • Preparation method of ultra-low turn-on voltage deep blue light organic electroluminescent device
  • Preparation method of ultra-low turn-on voltage deep blue light organic electroluminescent device
  • Preparation method of ultra-low turn-on voltage deep blue light organic electroluminescent device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The structural schematic diagram of the ultra-low turn-on voltage deep blue OLED device described in the present invention is as follows figure 2 shown. It can be seen from the figure that the structure of the ultra-low turn-on voltage deep blue OLED device is sequentially from the lower layer to the upper layer: a transparent conductive anode, a hole transport layer, a mixed light emitting layer, an electron transport layer, an electron buffer layer and a metal cathode. The structure of the prepared doped light-emitting device is:

[0043] Device 1: ITO / PEDOT:PSS / BN-Ullazine-a:PTAA / Bphen / LiF / Al

[0044] Device 2: ITO / PEDOT:PSS / BN-Ullazine-b:PTAA / Bphen / LiF / Al

[0045] Device 3: ITO / PEDOT:PSS / BN-Ullazine-c:PTAA / Bphen / LiF / Al

[0046] The preparation process of the deep blue OLED device comprises the following steps:

[0047] (1) The ITO glass substrate was ultrasonically cleaned with acetone, isopropanol, and deionized water for 20 minutes in sequence, and then dried ...

Embodiment 2

[0056] (1) Utilize 3-2-IHR221-NIR-TCSPC steady-state-transient fluorescence spectrometer to carry out photoluminescence spectrum (PL) test to BN-Ullazine derivative thin film and PTAA thin film spin-coated on ITO substrate respectively, as image 3 shown. It can be seen from the test results that the PL peak positions of the three BN-Ullazine derivative films whose substituents are methyl, trimethylphenyl, and phenyl are 358nm, 385nm, and 390nm in turn, and the PL peak positions of the PTAA film are about 420nm.

[0057] (2) Under vacuum conditions, use 3-2-IHR221-NIR-TCSPC steady-state-transient fluorescence spectrometer and Cryocooler cryostat to perform PL spectroscopy on BN-Ullazine derivative thin films at low temperature (77K) in liquid nitrogen test, such as Figure 4 shown. It can be seen from the test results that the PL spectra of the three BN-Ullazine derivative films broadened at low temperature, and new shoulder peaks appeared at 2.63eV, 2.61eV and 2.62eV, resp...

Embodiment 3

[0059] Luminescence performance tests were carried out on OLED devices 1-4, and the test results are summarized in Table 1.

[0060] Such as Figure 5 Shown are the EL spectra of OLED devices 1-4 of the present invention, and the EL peaks of devices 1-4 are all at 420 nm.

[0061] Such as Figure 6 Shown is the J-V-L characteristic curve of OLED device 1-4 of the present invention;

[0062] Such as Figure 7 Shown is the CE-J-PE characteristic curve of OLED device 1-4 of the present invention;

[0063] Such as Figure 8 Shown is a schematic diagram of the energy level of the OLED device of the present invention and the principle of light emission.

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Abstract

The invention relates to a preparation method of an ultra-low turn-on voltage deep blue light organic electroluminescent device. According to the invention, a methyl group, a phenyl group and a trimethylphenyl group are introduced to boron atoms on two sides of a BN-Ullazine derivative main body, and a benzyl group is introduced to a nitrogen atom; the material has a relatively wide optical band gap and a relatively high triplet state energy level; the triphenylamine polymer PTAA has the characteristics of high hole mobility, wide forbidden band structure, high fluorescence quantum yield and the like; the mixed light-emitting layer in the device is BN-Ullazine doped PTAA; a fluorescence up-conversion mechanism formed by a triplet-triplet annihilation (TTA) effect of a main body material BN-Ullazine derivative greatly improves the utilization rate of singlet excitons; the BN-Ullazinederivative is matched with the energy level structure of PTAA and has good energy transfer, so that singlet excitons generated by the BN-Ullazine derivative are promoted to be effectively transferred to the excited state energy level of PTAA, and efficient luminescence of PTAA is realized; and the performance of a device taking the BN-Ullazine:PTAA as the light-emitting layer is obviously improved, and the turn-on voltage is lower than the optical band gap energy of the PTAA.

Description

【Technical field】 [0001] The invention belongs to the technical field of organic electroluminescence, and relates to a method for preparing a BN-Ullazine derivative doped triphenylamine polymer with an ultra-low turn-on voltage deep blue organic electroluminescence device. 【Background technique】 [0002] Organic electroluminescent device (OLED) is a new generation of flat display and solid-state lighting technology. With its self-illumination, all-solid-state, wide viewing angle, high brightness, high efficiency, high image quality, fast response, light and thin volume and easy realization of flexibility And other excellent characteristics, showing good application prospects in many new electronic devices. [0003] The realization of colorization and self-illumination technology of OLED usually requires efficient and stable red, green and blue three-color organic light-emitting materials, so the synthesis and selection of light-emitting materials and the optimization of devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K85/111H10K85/657H10K50/11H10K71/00
Inventor 吴晓明晋孟佳刘旭光崔明宽芮红松杨楠兰宝发侯卉晴路宽宽印寿根
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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