High efficiency and high color purity deep-blue organic light-emitting diodes with blue index >500

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

Journal of the Society for Information Display Pub Date : 2024-05-10 DOI:10.1002/jsid.1309

Wei Gao, Yepeng Xiang, Jinghua Niu, Jianyun Wang, Long Chen, Bong-Geum Lee

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引用次数: 0

Abstract

Thermally activated delayed fluorescent (TADF) and phosphorescent blue organic light-emitting diodes (OLEDs) have been developed to overcome the relatively low triplet exciton utilization of traditional fluorescent OLEDs. However, broad emission spectra originating from charge transfer process limit the commercial application of such blue OLEDs. Herein, an effective phosphor-sensitized fluorescent (PSF) OLED device structure was designed. PSF OLED exhibited a maximum blue index (BI) of 508 cd/A/CIEy with CIEy of 0.060, which has been the highest efficiency result reported for PSF deep-blue OLEDs. A nearly 100% improvement in operational lifetime LT₉₅ (L/L₀ = 95%) was achieved successfully by using lower triplet energy (T₁) and deuterated host materials. Impressively, the sensitized OLEDs maintained BI of 407 cd/A/CIEy, narrow emission spectra (FWHM = 17 nm), and high color purity (CIEy = 0.046), revealing the attractive technical advantages and commercial application potential.

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高效率、高色纯度深蓝色有机发光二极管，蓝色指数大于 500

为了克服传统荧光有机发光二极管三重激子利用率相对较低的问题，人们开发了热激活延迟荧光（TADF）和磷光蓝色有机发光二极管（OLED）。然而，电荷转移过程产生的宽发射光谱限制了这种蓝色有机发光二极管的商业应用。本文设计了一种有效的荧光粉敏化（PSF）有机发光二极管器件结构。PSF OLED 的最大蓝光指数（BI）为 508 cd/A/CIEy，CIEy 为 0.060，这是目前已报道的 PSF 深蓝色 OLED 的最高效率结果。通过使用较低的三重能（T1）和氚化主材料，成功地将工作寿命 LT95（L/L0 = 95%）提高了近 100%。令人印象深刻的是，敏化的有机发光二极管保持了 407 cd/A/CIEy的BI、窄发射光谱（FWHM = 17 nm）和高色纯度（CIEy = 0.046），显示了极具吸引力的技术优势和商业应用潜力。

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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.