Dual Ag electrodes for semitransparent organic light-emitting diodes

Qian, Min; Liu, Quan; Li, Wenshi; Man, Jiaxiu; Zhao, Yong-Biao; Lu, Zheng‐Hong

doi:10.1016/j.orgel.2018.02.028

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…We use the MATLAB language software to do the simulations and provide the theoretical basis for the metal type and thickness selection [20,21]. The result is, as a transparent or semi-transparent electrode, Ag thin film is better than Al film.…”

Section: Metal Induced Transmission (Mit)mentioning

confidence: 99%

“…The calculated reflecting phase shift is φ1 =2.6169 rad. The cathode structure is organic/Ag 20 nm[20,21], the reflecting phase shift is φ2= 1.7995 rad. The dielectric function of Ag can be decided by Lorentz-Drude model[26][27][28][29][30][31][32], see supporting information, S1, S2, S3.ExperimentalBased on simulations using equations (2) and (3), we select the thickness of every layer considering the fact the Alq3/NPB interface is the source of emitting dipole.…”

mentioning

confidence: 99%

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Mechanism Study and the Role of Coupled Surface Plasmon Polaritons in Optical Out-Coupling Enhanced Top-Emitting OLEDs with a Dielectric Capped Ag Cathode

Wang¹,

Qian²,

Zhou³

2022

Preprint

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Classical optical transfer matrix method and micro-cavity theory is applied to compute optical out-coupling of Top-Emitting OLEDs (TEOLEDs). Optical paths of various functional organic films and electrode structures are included in the calculations. Fluorescent Alq3 green TEOLEDs were fabricated and tested based on theoretical calculations. For TEOLEDs with Ag cathodes plus NPB coatings, we experimentally observed significant enhancements in optical out-couplings compared to that of with bare Ag cathode. We also found that thin-film optics theory is insufficient to explain the observed enhancement. To explain the experimental results, we incorporated near-field radiation of electric dipole and its interactions with Ag cathode film, i.e., surface plasmon polaritons (SPPs) theory, coupled SPPs in a dielectric/metal/dielectric (D/M/D) structure. Therefore, we demonstrate that optical out-coupling enhancement has three contributing factors in a TEOLED: an increased transmittance of cathode Ag, a varied internal micro-cavity gain, and the dominant improved SPP coupling on both sides of the Ag film cathode.

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Section: Metal Induced Transmission (Mit)mentioning

confidence: 99%

mentioning

confidence: 99%

Mechanism Study and the Role of Coupled Surface Plasmon Polaritons in Optical Out-Coupling Enhanced Top-Emitting OLEDs with a Dielectric Capped Ag Cathode

Wang¹,

Qian²,

Zhou³

2022

Preprint

Self Cite

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“…Four conjugated polymers with superior film formation ability from a solution acted as the single emitting material (EM) producing red, green, blue and white spectra respectively. Silver, with great electrical and optical properties, was used as the electrode material [23][24][25][26][27][28]. A semi-transparent top silver layer and highly reflective bottom silver layer constituted the optical cavity.…”

Section: Introductionmentioning

confidence: 99%

Solution-processed, top-emitting, microcavity polymer light-emitting diodes for the pure red, green, blue and near white emission

Zhuang¹,

Zou²,

You³

et al. 2019

Nanotechnology

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Top-emitting microcavity polymer light-emitting diodes (TMPLEDs) are of great significance for active matrix PLED displays with high color purity. However, the complex device structures of highly efficient microcavity organic light-emitting diodes fabricated by the full vapor deposition technology are not suitable for solution-processed PLEDs. Solution-processed TMPLEDs with simple device structures are promising candidates for large-area, mass production display techniques. In this work, three strategies were used to apply microcavity into PLEDs: (1) double Ag electrodes performed as the mirrors of cavity, instead of a multi-layer Bragg reflector, which simplified the device structure and fabrication process; (2) three solution-processed functional layers were specially designed for avoiding the inter-infiltration between the different solutions and to improve the interface contacts; (3) high order microcavities were utilized according to the optical simulation results, in which thick EMLs benefited from thickness control and reproductivity. As a result, the full-color emission including pure red, green, blue was realized, and quasi-white light was also achieved from a single polymer emitting material. The achievement of color purity always requires the sacrifice of part of the current efficiency due to the spectra narrowing, while the higher current efficiency of green TMPLED (10.08 cd A−1) compared to that of non-cavity PLED (~8.60 cd A−1) cast a light on future improvements.

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“…We took the view that an exciplex host combined with the optimal micro-cavity effect 38–43 can potentially bring mutual benefits in resolving the issue of color purity and boosting the device performance: the exciplex host ensures 100% exciton harvesting and low driving voltages and the micro-cavity engineering with top-emitting techniques ensures narrow FWHM and high performance. This approach enables OLEDs to advance toward high-brightness applications such as augmented reality and virtual reality near-eye displays.…”

mentioning

confidence: 99%

Exciplex host coupled with a micro-cavity enabling high efficiency OLEDs with narrow emission profile

et al. 2022

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Dual Ag electrodes for semitransparent organic light-emitting diodes

Cited by 5 publications

References 13 publications

Mechanism Study and the Role of Coupled Surface Plasmon Polaritons in Optical Out-Coupling Enhanced Top-Emitting OLEDs with a Dielectric Capped Ag Cathode

Mechanism Study and the Role of Coupled Surface Plasmon Polaritons in Optical Out-Coupling Enhanced Top-Emitting OLEDs with a Dielectric Capped Ag Cathode

Solution-processed, top-emitting, microcavity polymer light-emitting diodes for the pure red, green, blue and near white emission

Exciplex host coupled with a micro-cavity enabling high efficiency OLEDs with narrow emission profile

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