Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers

Kang, Jin Sung; Yoon, Ju An; Yoo, Seung Il; Kim, Jin Wook; Yi, Seong‐Tae; Zhu, Fu Rong; Cheah, Kok Wai; Kim, Woo Young

doi:10.1016/j.optmat.2015.07.003

Cited by 10 publications

(2 citation statements)

References 30 publications

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“…Organic semiconductor components have been developed and studied in recent years [2][3][4][5][6][7][8][9]. Organic light emitting diode (OLED) and organic photovoltaic (OPV) devices are made on glass substrates or metal substrates which have excellent moisture-blocking ability in commercial products.…”

Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Tran

Lin

et al. 2018

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Abstract:The objective of this study is to investigate the effect of long-term static bending on the encapsulation properties of a commercial barrier thin film for flexible optoelectronic devices. Encapsulation properties of the barrier film are evaluated under long-term static bending at various radii of curvature. Experimental results reveal that no significantly detrimental effect on the water vapor transmission rate (WVTR) at 40 • C and 90% RH is found for compressive bending up to 1000 h and for tensile bending up to 100 h with a radius of curvature of 5 mm or larger. However, WVTR of the barrier thin film is significantly increased and cracks are found in the barrier film when subjected to tensile bending of a radius of 10 mm or 5 mm for 1000 h. The expected WVTR of the given barrier thin film is numerically computed using a three-dimensional (3D) finite element model. Numerical results indicate that, with the presence of cracks in the barrier thin film, the WVTR increases for an apparent increase in moisture entrances. The WVTR calculated by the 3D cracking model concurs with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Tran

Lin

et al. 2018

Coatings

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“…3,4 The green and red PHOLEDs with almost 100% IQE have been reported, while the IQE of the blue PHOLEDs is much lower than that of the green and red PHOLEDs reported. 5,6 One of the most challenging issues on the blue PHOLEDs for the realization in the commercial market is how to improve the efficiency and stability, due to the fact that the triplet exciton annihilation in the recombination zone (RZ), such as triplet-triplet annihilation (TTA), triplet-polaron annihilation (TPA) and field-induced quenching can lead to the efficiency roll-off. 7 Some methods have been reported for improving the PHOLEDs device performance, such as using double emitting layers (EMLs), [8][9][10][11] inserting interlayer in EML and designing buffer layer between transport layer and EML.…”

mentioning

confidence: 99%

Influence of Micro-Cavity Effect and Architecture in the Blue Phosphorescent Organic Light-Emitting Diodes

Kou

Feng

et al. 2017

ECS J. Solid State Sci. Technol.

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The performance of the blue phosphorescent organic light-emitting diodes (PHOLEDs) can be affected by the range of the recombination zone (RZ) and the architecture in the emitting layer (EML). In order to change the width and location of RZ, a series of devices with the double emitting layers are fabricated. The range of RZ can be judged by the electroluminescence spectra around 500 nm due to micro-cavity effect of RZ. Then, another series of devices with a single host EML1 (mCP:FIrpic, x nm) and a mixed host EML2 (mCP:TPBi:FIrpic, y nm) are fabricated under the same total thickness of EML (x+y = 30 nm), when x is 15 nm, the maximum luminance and power efficiency can reach 9073 cd/m2 (at 8 V) and 23.4 lm/W (at 103 cd/m2), respectively. Both the driving voltage and efficiency roll-off are also improved.

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Optoelectronic features of Y-shaped push–pull molecules based on imidazole

et al. 2016

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Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers

Cited by 10 publications

References 30 publications

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Effects of Long-Term Static Bending Deformation on a Barrier Thin Film for Flexible Organic Optoelectronic Devices

Influence of Micro-Cavity Effect and Architecture in the Blue Phosphorescent Organic Light-Emitting Diodes

Optoelectronic features of Y-shaped push–pull molecules based on imidazole

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