5.1: Purity of OLED‐Materials and the Implication on DevicePerformance

Becker, Heinrich; Bach, Ingrid; Holbach, Michael; Schwaiger, Jochen; Spreitzer, Hubert

doi:10.1889/1.3500471

Cited by 24 publications

(15 citation statements)

References 7 publications

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“…In addition, materials containing nitrogen, phosphorus (C 11 H 17 OP), and chlorine (C 10 H 20 ONCl) were detected. Halogens such as chlorine are particularly known to influence the lifetime3031. Thus, the correlations found here suggest that these materials are affecting the lifetime.…”

Section: Resultssupporting

confidence: 54%

“…Contamination from the outgassing of sealing resin29 and halogen impurities in the organic material3031 are another two sources of degradation that have been identified. Furthermore, residual water in the vacuum chamber during fabrication2425, which particularly affects the interface between the hole transport layer and the emission layer, has been shown to reduce lifetime by participating in degradation-inducing electrochemical reactions with the organic materials.…”

mentioning

confidence: 99%

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Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes

Fujimoto¹,

Suekane

Imanishi

et al. 2016

Sci Rep

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We evaluated the influence of impurities in the vacuum chamber used for the fabrication of organic light-emitting diodes on the lifetime of the fabricated devices and found a correlation between lifetime and the device fabrication time. The contact angle of the ITO substrates stored the chamber under vacuum were used to evaluate chamber cleanliness. Liquid chromatography-mass spectrometry was performed on Si wafers stored in the vacuum chamber before device fabrication to examine the impurities in the chamber. Surprisingly, despite the chamber and evaporation sources being at room temperature, a variety of materials were detected, including previously deposited materials and plasticizers from the vacuum chamber components. We show that the impurities, and not differences in water content, in the chamber were the source of lifetime variations even when the duration of exposure to impurities only varied before and after deposition of the emitter layer. These results suggest that the impurities floating in the vacuum chamber significantly impact lifetime values and reproducibility.

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Section: Resultssupporting

confidence: 54%

mentioning

confidence: 99%

Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes

Fujimoto¹,

Suekane

Imanishi

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In addition, materials containing nitrogen, phosphorus (C 11 H 17 OP), and chlorine (C 10 H 20 ONCl) were detected. Halogens such as chlorine are particularly known to influence the lifetime [11,12]. Thus, the correlations found here suggest that these materials are affecting the lifetime.…”

Section: Analysis Of Impurities In Vacuum Chambersupporting

confidence: 52%

3‐3: Influence of Vacuum Chamber Impurities on OLED Degradation

Fujimoto

Suekane

Imanishi

et al. 2017

Symp Digest of Tech Papers

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“…30,45,116 Halogenated impurities have been shown to be detrimental to the PLED device lifetime due to radical chain type degradation. 137 In addition, palladium black formed during polycondensation can be hard to remove completely. 132 Given that the vast majority of conjugated polymers are generated by transition-metal catalyzed coupling in which monomers containing aryl bromide are frequently employed, non-conjugated polymers, which are mainly synthesized by free-or living-radical polymerizations where no transition metals and halogens are involved, may have an advantage over the conjugated counterparts in this regard.…”

Section: Conjugated Versus Non-conjugated Polymers: Materials Preparatmentioning

confidence: 99%

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

Wong

2017

Journal of Elec Materi

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Polymer organic light-emitting diodes (PLED) are one of the most studied subjects in flexible electronics thanks to their economical wet fabrication procedure for enhanced price advantage of the product device. In order to optimize PLED efficiency, correlating the polymer structure with the device performance is essential. An important question for the researchers in this field is whether the polymer backbone is conjugated or not as it affects the device performance. In this review, recent advances in non-conjugated polymers employed as the emitting layer in PLED devices are first discussed, followed by their contrast with the conjugated counterparts in terms of polymer synthesis, sample quality, physical properties and device performances. Such comparison between conjugated and non-conjugated polymers for PLED applications is rarely attempted, and; hence, this review shall provide a useful insight of emitting polymers employed in PLEDs.

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5.1: Purity of OLED‐Materials and the Implication on DevicePerformance

Cited by 24 publications

References 7 publications

Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes

Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes

3‐3: Influence of Vacuum Chamber Impurities on OLED Degradation

Recent Advances in Polymer Organic Light-Emitting Diodes (PLED) Using Non-conjugated Polymers as the Emitting Layer and Contrasting Them with Conjugated Counterparts

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