A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

Xiang, Chaoyu; Koo, Wonhoe; So, Franky; Sasabe, Hiroyuki; Kido, Junji

doi:10.1038/lsa.2013.30

Cited by 265 publications

(171 citation statements)

References 21 publications

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“…Note that the emission of the devices reported here is light blue (although more saturated than the cyan colour of FIrpic). Colour tuning to achieve more saturated blue emission is commonly achieved in fluorescent blue display sub-pixels through the use of microcavities 23,29 Figure 6). …”

Section: Resultsmentioning

confidence: 99%

Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes

2014

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Organic light-emitting diodes are a major driving force of the current information display revolution due to their low power consumption and potentially long operational lifetime. Although electrophosphorescent organic emitters have significantly lower power consumption than fluorescent emitters, the short lifetime of electrophosphorescent blue devices has prevented their application in displays for more than a decade. Here, we demonstrate a novel blue electrophosphorescent device with a graded dopant concentration profile in a broadened emissive layer, leading to a lower exciton density compared with a conventional device. Thus, triplet-polaron annihilation that leads to long-term luminescent degradation is suppressed, resulting in a more than threefold lifetime improvement. When this strategy is applied to a two-unit stacked device, we demonstrate a lifetime of 616±10 h (time to 80% of the 1,000 cd m À 2 initial luminance) with chromaticity coordinates of [0.15, 0.29], representing a tenfold lifetime improvement over a conventional blue electrophosphorescent device.

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Section: Resultsmentioning

confidence: 99%

Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes

2014

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“…Introduction of dopants in active layer is easy to implement due to its simple process and low cost. Some organic molecules, 18,19 metal nanoparticles (NPs), 20,21 rare-earth NPs, 22,23 and inorganic quantum dots 24,25 have been doped into PSCs and further advanced their PCEs.…”

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confidence: 99%

The operation mechanism of poly(9,9-dioctylfluorenyl-2,7-diyl) dots in high efficiency polymer solar cells

Liu

Zhang

et al. 2015

Applied Physics Letters

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The highly efficient polymer solar cells were realized by doping poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) dots into active layer. The dependence of doping amount on devices performance was investigated and a high efficiency of 7.15% was obtained at an optimal concentration, accounting for a 22.4% enhancement. The incorporation of PFO dots (Pdots) is conducted to the improvement of Jsc and fill factor mainly due to the enhancement of light absorption and charge transport property. Pdots blended in active layer provides an interface for charge transfer and enables the formation of percolation pathways for electron transport. The introduction of Pdots was proven an effective way to improve optical and electrical properties of solar cells.

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“…Conventional OLEDs, which are applied in combination with such optical filters, are usually based on a bottom emission architecture, where the emitted light passes through the transparent electrode and substrate [8,9]. In the past, optical mirrors such as DBRs have only been used to improve the light extraction for increase of the light outcoupling efficiency [10][11][12][13] or to realize optical lasing [14]. However, there is also the possibility to integrate OLED and filter in sensor technology in very compact designs as well as nearly unlimited shapes and sizes of homogeneous emission area.…”

Section: Introductionmentioning

confidence: 99%

Narrow Bandwidth Top-Emitting OLEDs Designed for Rhodamine 6G Excitation in Biological Sensing Applications

et al. 2015

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Organic light emitting diodes (OLED) are promising candidates offering in optical sensor applications to detect different gas compositions and excitable optical marker groups in chemical and biological processes. They enable attractive solutions for monitoring the gas phase composition of e.g., dissolved molecular oxygen (O2) species in bio reactors or excitation of fluorescent markers. In this work, we investigate different OLED devices for biomedical applications to excite the fluorescent dye rhodamine 6G (R6G). The OLED devices are built in top emission geometry comprising a distributed Bragg reflector (DBR) acting as optical mirror. The OLED is optimized to provide a very narrow emission characteristic to excite the R6G at 530 nm wavelength and enabling the possibility to minimize the optical crosstalk between the OLED electroluminescence and the fluorescence of R6G. The DBR includes a thin film encapsulation and enables the narrowing of the spectral emission band depending on the number of DBR pairs. The comparison between optical simulation data and experimental results exhibits good agreement and proves process stability. OPEN ACCESSElectronics 2015, 4 983

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A systematic study on efficiency enhancements in phosphorescent green, red and blue microcavity organic light emitting devices

Cited by 265 publications

References 21 publications

Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes

Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes

The operation mechanism of poly(9,9-dioctylfluorenyl-2,7-diyl) dots in high efficiency polymer solar cells

Narrow Bandwidth Top-Emitting OLEDs Designed for Rhodamine 6G Excitation in Biological Sensing Applications

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