Organic light-emitting diode and preparation method thereof

A luminescent and diode technology, applied in the field of organic electroluminescent diodes and its preparation, can solve the problems of OLED life reduction, light-emitting device life short, energy loss, etc., to reduce efficiency roll-off, improve device life, and prolong service life Effect

Inactive Publication Date: 2019-06-07
AAC TECH NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to the relatively long lifetime of the triplet excitons of phosphorescent materials (on the microsecond level), at high current densities, on the one hand, it will lead to a wide range of excitation diffusion, and part of the excitons diffuse beyond the adjacent light-emitting layer. On the other hand, these high-energy state excitons will also chemically degrade and annihilate the hole transport material or electron transport material, resulting in a decrease in the life of the OLED.
The above situations will cause serious efficiency roll-off of OLED devices under high brightness, resulting in short life of light-emitting devices

Method used

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  • Organic light-emitting diode and preparation method thereof
  • Organic light-emitting diode and preparation method thereof
  • Organic light-emitting diode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The energy level distribution situation of each material in embodiment 1 is as image 3 shown.

[0047] In order to reflect the technical effect of the device of Example 1, the comparative device of Example 1 (device 1-2) without an efficiency enhancing layer and without an exciton delay layer is used as a comparison:

[0048] ITO / HT001(60nm) / HT002(5nm) / EHS001:PB001(50nm, 8wt%) / ET001(25nm) / LIF(1nm) / Al(100nm).

[0049] The performance data are shown in Table 1 below:

[0050] Table 1 Embodiment 1 device performance comparison data

[0051]

[0052] Figure 4 It is a graph comparing the current density-voltage curves of device 1-1 and device 1-2; from Figure 4 It can be seen that at the same voltage, the current density of device 1-1 is lower than that of device 1-2, because the mobility of the exciton delay layer is lower than that of the electron transport layer.

[0053] Figure 5 It is a graph comparing the brightness-voltage curves of device 1-1 and device ...

Embodiment 2

[0063] In order to reflect the technical effect of the device of Example 2, the comparative device of Example 2 (device 2-2) without the efficiency enhancement layer and the exciton delay layer is used as a comparison:

[0064] The performance data comparison of ITO / HT001(60nm) / HT002(5nm) / EHS001:PB001(50nm, 8wt%) / ET001(25nm) / LIF(1nm) / Al(100nm) is shown in Table 2 below:

[0065] Table 2 Embodiment 2 device performance comparison data

[0066]

[0067] The third embodiment of the present invention relates to an organic electroluminescent diode, which is a modification of the organic electroluminescent diode of the first embodiment, and its structure is as follows: Figure 11 shown. The organic electroluminescent diode includes a substrate 10B, a first electrode 20B, a hole transport layer 30B, a composite light emitting unit 40B, an electron transport layer 50B and a second electrode 60B stacked in sequence. The composite light-emitting unit 40B in this embodiment includes...

Embodiment 3

[0074] In order to reflect the technical effect of the device of Example 3, the comparative device of Example 3 (device 3-2) without the efficiency enhancement layer and the exciton delay layer is used as a comparison:

[0075] ITO / HT001(65nm) / HHS001:PB001(50nm,8wt%) / ET001(25nm) / LIF(1nm) / Al(100nm)

[0076] The performance data comparison is shown in Table 3 below:

[0077] Table 3 Embodiment 3 device performance comparison data

[0078]

[0079] The fourth embodiment of the present invention relates to an organic electroluminescent diode, which is an improvement on the organic electroluminescent diode of the third embodiment, and its structure is as follows: Figure 13 shown. Specifically, in the composite light-emitting unit of the organic electroluminescent diode in this embodiment, the light-emitting unit group includes not only one light-emitting unit, but 2 to 64 light-emitting units stacked in sequence; wherein, the composition of each light-emitting unit It is the...

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Abstract

The present invention belongs to the technical field of organic electroluminescence, and discloses an organic light-emitting diode (OLED) and a preparation method thereof. The OLED comprises a substrate, a first electrode, a hole transport layer, a compound EML, an electron transport layer and a second electrode which are stacked in order. The compound EML comprises a luminescence unit set formedby n luminescence units, and an exciton-retared layer stacked at one side of the luminescence unit set; and each luminescence unit comprises a luminescence layer and an efficiency-enhanced layer stacked at one side of the luminescence layer. The efficiency-enhanced layers and the exciton-retared layers are added in the OLED to effectively improve the efficiency roll-off of the OLED, improve the luminous efficiency of the device and prolong the use life of the device.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence, and in particular relates to an organic electroluminescence diode and a preparation method thereof. Background technique [0002] An organic light emitting diode (Organic Light-emitting Diode, OLED) is composed of two opposite electrodes and a multi-layer organic material film with semiconducting properties interposed therebetween. These organic materials emit light when a charge passes through them, a phenomenon known as organic luminescence. [0003] In OLED organic light-emitting materials, phosphorescent materials can use triplet and singlet excitons at the same time, and the internal quantum efficiency can theoretically reach 100%, which can overcome the efficiency of traditional fluorescent light-emitting materials that only use singlet excitons. Do not exceed the 25% limit for efficient display. Usually, for phosphorescent materials, host-guest doped light-emitting st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
Inventor 张训路梁丰
Owner AAC TECH NANJING
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