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A high-efficiency white light organic electroluminescent device

An electroluminescent device, organic technology, applied in the direction of electric solid devices, electrical components, luminescent materials, etc., can solve the problems of triplet energy level mismatch and low luminous efficiency.

Active Publication Date: 2016-09-07
GUAN YEOLIGHT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For this reason, the technical problem to be solved by the present invention is that in the prior art, triplet energy level mismatch easily occurs between the blue fluorescent light-emitting layer and the red-green phosphorescent light-emitting layer, resulting in low luminous efficiency, and then provides a high-efficiency, White organic electroluminescent devices with good chromaticity, long lifetime and high color rendering index

Method used

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  • A high-efficiency white light organic electroluminescent device
  • A high-efficiency white light organic electroluminescent device
  • A high-efficiency white light organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] The device structure of this embodiment is as follows:

[0145] HAT / MTDATA / HAT / NPB / HTL-2:Ir(MDQ) 2 (acac) / HTL-2:ET-2:Ir(ppy) 3 / HTL-2:ET-2 / ADN:BD-1 / ETL-1 / LiF / Al

[0146] This embodiment provides a white light OLED device with three light-emitting centers. The three light-emitting layers are red, green, and blue in turn. The red phosphorescent light-emitting layer uses the compound shown in the formula HTL-2 as the host material, and Ir(MDQ) 2 (acac) as a dye; the main material of the green phosphorescent light-emitting layer is a mixture of two materials, which are the compound shown in formula HTL-2 and the bis(9,9'-spirobifluoren-2-yl) shown in formula ET-2 ketone), the dye is Ir(ppy) 3 ; The barrier layer is a compound shown in formula HTL-2, a mixture of bis (9,9'-spirobifluoren-2-yl) ketone shown in ET-2); the main material of the blue fluorescent light-emitting layer is ADN, and the dye is the formula The compound shown in BD-1; the electron transport materia...

Embodiment 2

[0157] The device structure and preparation method of Examples 2-5 are basically the same as those of Example 1, except that in step ⑥, in Example 2, the compound shown in formula HTL-2 is doped with a compound shown in formula ET-2. The evaporation thickness is 5nm, wherein the compound represented by the hole transport material formula HTL-2 accounts for 35wt% of the barrier layer, and the compound represented by the electron transport material formula ET-2 accounts for 65wt% of the barrier layer.

Embodiment 3

[0158] In Example 3, the compound shown in the formula HTL-2 doped with the compound shown in the formula ET-2 has an evaporation thickness of 5nm, wherein the compound shown in the hole transport material formula HTL-2 accounts for 15wt% of the barrier layer, and the electron transport material formula The compound shown in ET-2 accounts for 85wt% of the barrier layer.

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Abstract

The invention relates to a high-efficient white-light organic electroluminescence device which comprises a substrate, an anode layer, a luminous unit layer and a cathode layer; the luminous unit layer comprises a hole injection layer which is formed on the anode layer, a hole transport layer is formed on the hole injection layer, the cathode layer is formed on an electron transport layer, a plurality of luminous layers are arranged between the hole transport layer and the electron transport layer, each luminous layer comprises a fluorescence luminous layer and a phosphorescence luminous layer, and a barrier layer consisting of an electron transport material and a hole transport material of the same parent nucleus is arranged between the fluorescence luminous layer and the phosphorescence luminous layer; and a main body material of the phosphorescence luminous layer which is adjacent to the barrier layer comprises an electron transport material and a hoe transport material of the same parent nucleus. The luminous device can effectively allocate the electron transport efficiency and the hole transport efficiency and has the advantage of high luminous efficiency.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to a high-efficiency white light organic electroluminescent device. Background technique [0002] The light-emitting layer of the organic electroluminescent device OLED is mainly made of all fluorescent materials, all phosphorescent materials or a mixture of fluorescent materials and phosphorescent materials. Phosphorescent materials can achieve high luminous efficiency, but due to short lifetime and low efficiency, no suitable blue phosphorescent materials have been developed yet. Although the chromaticity and lifespan of the all-fluorescent material have strong advantages, the efficiency is lower than that of the all-phosphorescent material and the structure of the hybrid method. At present, blue fluorescent materials and red-green phosphorescent materials are generally used together as the light-emitting layer of OLEDs, but because the triplet energy l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52H01L51/54C09K11/06
Inventor 邱勇李艳蕊董艳波段炼张国辉李建仁
Owner GUAN YEOLIGHT TECH CO LTD
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