Synthesis of N-type host materials based on indocarbazole and s-triazine and properties in green phosphorescent devices

Yu LIU; Xiao-feng TAN; Qian CHEN; Lei DAI; Wen-ping XIAO; Yan-ping HUO

doi:10.37188/CJLCD.2022-0034

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Synthesis of N-type host materials based on indocarbazole and s-triazine and properties in green phosphorescent devices

Material Physics | 更新时间：2022-06-14

- Synthesis of N-type host materials based on indocarbazole and s-triazine and properties in green phosphorescent devices
- Chinese Journal of Liquid Crystals and Displays Vol. 37, Issue 4, Pages: 425-436(2022)
- 作者机构：
  
  1.广东工业大学轻工化工学院，广东广州 510006
  2.广东阿格蕾雅光电材料有限公司，广东佛山 528300
- 作者简介：
- 基金信息：
  
  supported by the National Natural Science Foundation of China(U2001222);the Science and Technology Planning Project of Guangdong(2021A0505030069)
- DOI：10.37188/CJLCD.2022-0034
  CLC： TN383⁺.1
- Received：28 January 2022，
  
  Revised：22 February 2022，
  
  Published：05 April 2022
- 稿件说明：
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Yu LIU, Xiao-feng TAN, Qian CHEN, et al. Synthesis of N-type host materials based on indocarbazole and s-triazine and properties in green phosphorescent devices[J]. Chinese journal of liquid crystals and displays, 2022, 37(4): 425-436.
DOI：

Yu LIU, Xiao-feng TAN, Qian CHEN, et al. Synthesis of N-type host materials based on indocarbazole and s-triazine and properties in green phosphorescent devices[J]. Chinese journal of liquid crystals and displays, 2022, 37(4): 425-436. DOI： 10.37188/CJLCD.2022-0034.

摘要

为了获得低驱动电压、长寿命和高光效的有机电致发光二极管（OLED），本文介绍了一系列基于1，3，5-三嗪和7，7-二甲基-5，7-二氢茚并［2，1-b］咔唑的新型n型磷光主体材料DTRz、DBTRz和DCNTRz。首先，对它们的电化学性质、光物理性能及热稳定性进行研究，并进行密度泛函理论（DFT）计算。实验与计算分析结果表明：DTRz、DBTRz和DCNTRz具有较高的三线态能级（2.83，2.71，2.72 eV），较高的分解温度（411，499，419

C），随后与P型主体NBPBC（1∶1）混合后对其光致发光光谱进行研究，并以此为基础，以Pt（BBP）为客体掺杂剂进行了器件制备。器件结果分析表明，DCNTRz∶NBPBC为基础的器件的启动电压为2.1 V，最高外量子效率达14.3%，最大亮度达221 589 cd·m

-2

，在1 000 cd·m

-2

下电流效率最高达46.5 cd·A

-1

，最大功率效率达45.7 lm·W

-1

。特别是在4 000 cd·m

-2

下器件寿命（LT95）达282 h，比以DTRz∶NBPBC为基础的器件的寿命提高了54%，实现了同时具备低启动电压、高寿命和高光效等优越性能的绿光OLED。

Abstract

In order to obtain organic electroluminescent diodes （OLEDs） with low driving voltage，long lifetime and high light efficiency，a series of novel n-type host materials DTRz，DBTRz and DCNTRz based on 1，3，5-triazine and 7，7-dimethyl-5，7-dihydroindolinazol ［2，1-b］ carbazole are introduced in this paper. First，their electrochemical properties，photophysical properties and thermal stability were studied，and DFT calculations were performed. The experimental and computational analysis results show that DTRz，DBTRz and DCNTRz have higher triplet energy levels （2.83，2.71，2.72 eV），higher decomposition temperatures （411，499，419

C）. Then，the photoluminescence spectrum was studied after mixing with P-type host NBPBC （1∶1），and based on this，the device was fabricated with Pt（BBP） as the guest dopant. The analysis of the device results shows that the DCNTRz∶NBPBC-based device has a turn-on voltage of 2.1 V，a maximum external quantum efficiency of 14.3%，a maximum brightness of 221 589 cd·m

-2

，a current efficiency of 46.5 cd·A

-1

at 1 000 cd·m

-2

，and a maximum power efficiency of 45.7 lm·W

-1

.In particular，the device lifetime （LT95） reaches 282 h at 4 000 cd·m

-2

. 54% higher lifetime than DTRz∶NBPBC-based devices. A green OLED with excellent performance such as low turn-on voltage，high lifetime and high luminous efficiency is realized.

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Keywords

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