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High efficiency and high color purity deep‐blue organic light‐emitting diodes with blue index >500
Ist Teil von
Journal of the Society for Information Display, 2024-05, Vol.32 (5), p.435-442
Ort / Verlag
Campbell: Wiley Subscription Services, Inc
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Wiley Online Library Journals【キャンパス外アクセス可】
Beschreibungen/Notizen
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.
An effective phosphor‐sensitized fluorescent organic light‐emitting diode (OLED) device structure was elaborately fabricated to achieve a maximum blue index of 508 cd/A/CIEy with CIEy of 0.060, which has been the highest efficiency result reported for PSF deep‐blue OLEDs.