Developing sensitized green fluorescence for efficient, stable narrowband organic light emitting diodes

IF 1.7 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of the Society for Information Display Pub Date : 2024-04-28 DOI:10.1002/jsid.1287

Paramasivam Palanisamy, Odugu Pavan Kumar, Hae Ung Kim, Jang Hyuk Kwon

{"title":"Developing sensitized green fluorescence for efficient, stable narrowband organic light emitting diodes","authors":"Paramasivam Palanisamy, Odugu Pavan Kumar, Hae Ung Kim, Jang Hyuk Kwon","doi":"10.1002/jsid.1287","DOIUrl":null,"url":null,"abstract":"The thermally activated delayed fluorescence (TADF) or phosphorescence-sensitized organic light-emitting diodes (OLEDs) based on multi-resonance TADF (MR-TADF) emitters are greatly studied to develop an effective narrowband emitting system for wide color gamut display applications. However, developing pure green OLEDs to meet BT2020 and NTSC requirements is challenging. In this study, we investigated the TADF and phosphorescence-sensitized OLEDs based on two green MR-TADF final emitters, namely, BpIC-DPA and BpIC-Cz. The unique molecular structure of these emitters resulted in a pure green emission with narrow full width at half-maximum (FWHM) and high PLQY in both solution and solid state. Notably, under optimal conditions, the BpIC-Cz-based OLEDs demonstrated a maximum external quantum efficiency (EQEmax) of 25.7% with alleviated efficiency roll-off characteristics even at high luminescence (EQE5000 nits = 22.6%). The corresponding CIE coordinates are almost at the level of BT2020 and NTSC green-color industrial standards. Additionally, the BpIC-Cz-based device displayed remarkable stability as seen by a noticeably longer device lifetime (LT90) of 25.3 h at a high initial luminance of 5000 nits.","PeriodicalId":49979,"journal":{"name":"Journal of the Society for Information Display","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Society for Information Display","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jsid.1287","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}

引用次数: 0

Abstract

The thermally activated delayed fluorescence (TADF) or phosphorescence-sensitized organic light-emitting diodes (OLEDs) based on multi-resonance TADF (MR-TADF) emitters are greatly studied to develop an effective narrowband emitting system for wide color gamut display applications. However, developing pure green OLEDs to meet BT2020 and NTSC requirements is challenging. In this study, we investigated the TADF and phosphorescence-sensitized OLEDs based on two green MR-TADF final emitters, namely, BpIC-DPA and BpIC-Cz. The unique molecular structure of these emitters resulted in a pure green emission with narrow full width at half-maximum (FWHM) and high PLQY in both solution and solid state. Notably, under optimal conditions, the BpIC-Cz-based OLEDs demonstrated a maximum external quantum efficiency (EQE_max) of 25.7% with alleviated efficiency roll-off characteristics even at high luminescence (EQE_{5000 nits} = 22.6%). The corresponding CIE coordinates are almost at the level of BT2020 and NTSC green-color industrial standards. Additionally, the BpIC-Cz-based device displayed remarkable stability as seen by a noticeably longer device lifetime (LT₉₀) of 25.3 h at a high initial luminance of 5000 nits.

查看原文本刊更多论文

开发敏化绿色荧光，实现高效、稳定的窄带有机发光二极管

基于多共振延迟荧光（MR-TADF）发射器的热激活延迟荧光（TADF）或磷光敏化有机发光二极管（OLED）得到了广泛的研究，以便为宽色域显示应用开发有效的窄带发射系统。然而，要开发出符合 BT2020 和 NTSC 要求的纯绿色 OLED 却极具挑战性。在本研究中，我们研究了基于两种绿色 MR-TADF 最终发射体（即 BpIC-DPA 和 BpIC-Cz）的 TADF 和磷光敏化 OLED。这些发射体的独特分子结构使其在溶液和固体状态下都能发出具有窄半最大全宽（FWHM）和高PLQY的纯绿色发射。值得注意的是，在最佳条件下，基于 BpIC-Cz 的有机发光二极管显示出 25.7% 的最大外部量子效率（EQEmax），即使在高发光条件下（EQE5000 nits = 22.6%），效率滚降特性也有所缓解。相应的 CIE 坐标几乎达到了 BT2020 和 NTSC 绿光工业标准的水平。此外，基于 BpIC-Cz 的器件显示出显著的稳定性，在 5000 尼特的高初始亮度下，器件寿命（LT90）明显延长至 25.3 小时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of the Society for Information Display 工程技术-材料科学：综合

CiteScore

4.80

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： The Journal of the Society for Information Display publishes original works dealing with the theory and practice of information display. Coverage includes materials, devices and systems; the underlying chemistry, physics, physiology and psychology; measurement techniques, manufacturing technologies; and all aspects of the interaction between equipment and its users. Review articles are also published in all of these areas. Occasional special issues or sections consist of collections of papers on specific topical areas or collections of full length papers based in part on oral or poster presentations given at SID sponsored conferences.