Decay mechanisms of a blue organic light emitting diode

Ni, Shao‐Fei; Wang, X. R.; Wu, Yi-nan; Chen, H. Y.; Zhu, Wen Qing; Jiang, Xue-Yin; Zhang, Z. L.; Sun, Rong

doi:10.1063/1.1777819

Cited by 19 publications

(8 citation statements)

References 13 publications

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“…Even at an initial luminance of 1000 cd/m 2 , the lifetime is as long as 30920 h. To the best of our knowledge, this is the first hybrid WOLED with long lifetime in the revealed literature so far. Since the half lifetimes for TVs applications must be about 100000 h 30 , it is obviously seen that our device can satisfy this practical demand. On one hand, although all-fluorescent WOLEDs can exhibit long lifetime over 150000 h at 1000 cd/m 2 , the maximum efficiency is only 14.7 cd/A because the triplet excitons cannot be harvested 34 .…”

Section: Resultsmentioning

confidence: 96%

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Efficient hybrid white organic light-emitting diodes with extremely long lifetime: the effect of n-type interlayer

Liu

Wang

et al. 2014

Sci Rep

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The effect of n-type interlayer in hybrid white organic light-emitting diodes (WOLEDs) has been systematically investigated by using various n-type materials. A new finding, that the triplet energy rather than electron mobility or hole-blocking ability of interlayer plays a more positive role in the performance of hybrid WOLEDs, is demonstrated. Based on the new finding, a more efficient n-type interlayer bis[2-(2-hydroxyphenyl)-pyridine] beryllium has been employed to realize a high-performance hybrid WOLED. The resulting device (without n-doping technology) exhibits low voltages (i.e., 2.8 V for 1 cd/m2, 3.9 V for 100 cd/m2) and low efficiency roll-off (i.e., 11.5 cd/A at 100 cd/m2 and 11.2 cd/A at 1000 cd/m2). At the display-relevant luminance of 100 cd/m2, a total power efficiency of 16.0 lm/W, a color rendering index of 73 and an extremely long lifetime of 12596265 h are obtained. Such superior results not only comprehensively indicate that the n-type materials are effective interlayers to develop high-performance hybrid WOLEDs but also demonstrate a significant step towards real commercialization in WOLEDs.

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Section: Resultsmentioning

confidence: 96%

“…Finally, since the device lifetime is essential to practical use 30 31 32 , we have measured the lifetime of W6. As shown in figure 4b , a half lifetime of 75.9 h at an initial luminance of 10000 cd/m 2 is obtained.…”

Section: Resultsmentioning

confidence: 99%

Efficient hybrid white organic light-emitting diodes with extremely long lifetime: the effect of n-type interlayer

Liu

Wang

et al. 2014

Sci Rep

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“…The E LUMO is very close to the widely used organic green emitter, tris-(8-hydroxyquinolinato)-aluminium (Alq 3 ) whose OLEDs have been optimized to give a high external quantum efficiency of ∼12% at 100 Cd/m 2 . 12…”

Section: Characterization Of Cf3-dpamentioning

confidence: 99%

“…About a couple of years back, a new series of undoped 9,10-DPA-based blue fluorophores was synthesized with bulky substituents which showed much higher EQE of 4.5% 11 as compared to unsubstituted DPA (EQE-1.5%) or doped 9,10-DPA (EQE ∼ 2%). 12 Subsequently, several attempts were made to improve the emission and thin film properties of anthracene derivatives. [13][14][15][16][17][18] It was demonstrated that the film forming properties of DPA can be improved by introducing bulky aryl substituents at the 2-and 6-positions of anthracene (instead of the 9-and 10positions).…”

Section: Introductionmentioning

confidence: 99%

Deep blue organic light-emitting diodes of 1,8-diaryl anthracene

et al. 2018

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We report on the optimization of organic light emitting diode (OLED) devices using 1,8-di-(4trifluromethylphenyl)-anthracene (CF3-DPA) as the active emissive layer. CF3-DPA emits in the deep blue region with an emission peak at 432 nm in solution which showed a slight red shift in thin films. CF3-DPA has high reported fluorescence quantum efficiency, ∼67%, as compared to 9,10-diphenyl anthracene (9,10-DPA). We optimized the OLED devices with different hole transporting layers (HTLs). Bilayer devices formed with N ,N-di(1-naphthyl)-N ,N-diphenyl-(1,1-biphenyl)-4,4-diamine (NPD) as the HTL gave a reasonable light output. We observed that trilayer or multilayer devices with the inclusion of poly(3,4-ethylene dioxythiophene)poly(styrene sulfonate) (PEDOT:PSS) and/or copper phthalocyanine as an additional HTL reduced the turn on voltage by ∼5 to 9 V, though the brightness of the light emission also decreased. Including suitable carrier (electron or hole) transporting layers like 2, 2 ,2-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) and 4,4-Bis(N-carbazolyl)-1,1-biphenyl (CBP) increases the efficiency of the devices. From our studies, we conclude that though NPD/CF3-DPA interface is crucial for light emission, the performance of the devices is limited by the mismatch of the hole and electron mobilities and the low internal quantum efficiency of CF3-DPA in the solid state. Devices having ITO/NPD/CF3-DPA/TPBi/LiF-Al geometry were observed to be the most efficient.

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“…However, the lifetime of the organic devices remains a major challenge that must be overcome before the wide application of WOLED technology 4. For example, the television application requires a lifetime of at least 100 000 h at video brightness without noticeable color shift 5. As reported by Kodak researchers, WOLEDs with high correlated color temperatures (CCT) are favored for display application, which requires a significant amount of blue contribution in the white emission 6.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Recombination Zone of White Organic Light‐Emitting Diodes with Extremely Long Lifetimes

Duan

Zhang

et al. 2011

Adv Funct Materials

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The lifetime of the organic devices remains a major challenge that must be overcome before the wide application of white organic light‐emitting diodes (WOLEDs) technology. In this work, we present a new strategy to achieve WOLEDs with an extremely long lifetime by wisely control of the recombination zone. A blue emitting layer of 6,6′‐(1,2‐ethenediyl)bis(N‐2‐naphthalenyl‐N‐phenyl‐2‐naphthalenamine doped 9‐(1‐naphthyl)‐10‐(2‐naphthyl)‐anthracene was deposited on top of the mixed host blue emitting layer to prevent hole penetration into the electron transporting layer and to attain better confinement of carrier recombination. In this way, we obtained a WOLED with a record high lifetime of over 150 000 hours at an initial brightness of 1000 cd m−2, 40 times longer than the conventional bilayer WOLED. The electroluminescent spectra of the long‐lived WOLED showed almost no color‐shifting after accelerated aging. It is anticipated that these results might be a starting point for further research towards ultrastable OLED displays and lightings.

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Decay mechanisms of a blue organic light emitting diode

Cited by 19 publications

References 13 publications

Efficient hybrid white organic light-emitting diodes with extremely long lifetime: the effect of n-type interlayer

Efficient hybrid white organic light-emitting diodes with extremely long lifetime: the effect of n-type interlayer

Deep blue organic light-emitting diodes of 1,8-diaryl anthracene

Controlling the Recombination Zone of White Organic Light‐Emitting Diodes with Extremely Long Lifetimes

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