Effect of driving method on the degradation of organic light emitting diodes

Cusumano, Pasquale

doi:10.1016/s0379-6779(03)00243-1

Cited by 30 publications

(20 citation statements)

References 13 publications

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“…This suggest that 'sudden death' of OLEDs can be avoided by operating the diode intermittently, allowing for self-healing of defects during resting periods. This is consistent with reports of prolonged lifetime of OLEDS under pulsed illumination in comparison with DC drive voltages [41,42].…”

Section: Resultssupporting

confidence: 93%

Sudden death of organic light-emitting diodes

Rocha

Gomes

Asadi

et al. 2015

Organic Electronics

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Section: Resultssupporting

confidence: 93%

Sudden death of organic light-emitting diodes

Rocha

Gomes

Asadi

et al. 2015

Organic Electronics

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“…The estimated current density was at least 10 6 times higher than that of a spin coated PBLG film ͑SC PBLG ͒, and was of the same order of magnitude, if not higher, than that of regular organic thin film diodes. [26][27][28] Our data suggested that the electron transport in the PBLG film is highly anisotropic, and strongly correlated with the helical and dipole order. This observation may be supported by the recent ab initio calculations, which predicted that the ␣-helical peptide backbones possess intrinsic diode characteristics, and that the electrons transport through the hydrogen bonds along the helical axis.…”

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confidence: 62%

Controlled growth of aligned α-helical-polypeptide brushes for tunable electrical conductivity

Chen

et al. 2011

Applied Physics Letters

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Polypeptide based molecular diode with high rectification ratio (∼122 at ±0.422 V) is formed by controlling molecular order and orientation. A film of tethered poly(γ-benzyl-L-glutamate) (PBLG) with high degree of molecular orientation was formed by solvent pair (good/bad) treatment. I-V characterization of the well aligned polypeptides showed that the rectification ratio of PBLG was sufficiently large for potential diode and transistor applications.

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“…The driving method (direct current (DC) or pulsed current (PC)) is an important factor in determining the stability and lifetime of device. Previously [9][10][11][12], the lifetimes of OLEDs operating in PC mode were reported to be longer than those operating in DC mode. This was attributed to reasons such as the reduced speed of migration of ionic impurities in the OLEDs [13,14], the reduction of the number of holes injected into the Alq 3 layer by the reverse electric field of the PC driving mode [11].…”

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confidence: 99%

“…Previously [9][10][11][12], the lifetimes of OLEDs operating in PC mode were reported to be longer than those operating in DC mode. This was attributed to reasons such as the reduced speed of migration of ionic impurities in the OLEDs [13,14], the reduction of the number of holes injected into the Alq 3 layer by the reverse electric field of the PC driving mode [11]. As a result, the PC driving mode has been adopted in many OLED applications because of its long associated lifetime [9][10][11][12][15][16][17].…”

mentioning

confidence: 99%

“…This was attributed to reasons such as the reduced speed of migration of ionic impurities in the OLEDs [13,14], the reduction of the number of holes injected into the Alq 3 layer by the reverse electric field of the PC driving mode [11]. As a result, the PC driving mode has been adopted in many OLED applications because of its long associated lifetime [9][10][11][12][15][16][17]. Recently, however, Luo et al [18] found that the PC driving mode did not always lead to the longer lifetime for devices.…”

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confidence: 99%

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Dependence of the stability of organic light-emitting diodes on driving mode

Zhang

et al. 2011

Chin. Sci. Bull.

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We investigated the effects of pulsed current (PC) and direct current (DC) driving modes on the stability of organic light-emitting diodes with and without hole-injection layers (HILs). Two different HIL materials were used: copper phthalocyanine (CuPc) and 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MDTATA). It was found that the half-lives of devices using PC driving modes were different from those of comparable devices using DC driving modes. For the devices without HILs, with CuPc HILs and with MTDATA HILs, the half-lives of the devices were changed by factors of 1.91, 1.41 and 0.86, respectively, when operated in PC rather than DC driving modes. Our analysis of the electrical characteristics of the corresponding hole-only devices showed that the number of holes injected into devices was greatly reduced by inserting an m-MTDATA layer compared with other designs. The results indicate that different ratios of injected electrons and holes can be obtained in these devices. Moreover, these ratios play a dominant role in the dependence of the stability of the device on the driving mode. organic light-emitting diodes, stability, driving mode, electrons, holes Citation:Zhang W W, Wu Z X, Zhang X W, et al. Dependence of the stability of organic light-emitting diodes on driving mode.

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Effect of driving method on the degradation of organic light emitting diodes

Cited by 30 publications

References 13 publications

Sudden death of organic light-emitting diodes

Sudden death of organic light-emitting diodes

Controlled growth of aligned α-helical-polypeptide brushes for tunable electrical conductivity

Dependence of the stability of organic light-emitting diodes on driving mode

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