Theoretical comparison of the excitation efficiency of waveguide and surface plasmon modes between quantum-mechanical and electromagnetic optical models of organic light-emitting diodes

Kang, Kyungnam; Kim, Kyoung-Youm; Kim, Jungho

doi:10.1364/oe.26.00a955

Cited by 6 publications

(10 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, which also confirms that all the TM modes in this top-emitting OLED structure are SP mode-like confined mode [21]. .…”

Section: Eml N supporting

confidence: 74%

“…The imaginary part of the effective mode index corresponds to the extinction coefficient of each TM mode. The real parts of all the effective mode indices in Table 1 are greater than n EML = 1.73, which also confirms that all the TM modes in this top-emitting OLED structure are SP mode-like confined mode [21]. modes, are denoted as TM0, TM1, and TM2, which are named in the ascending order of the real part of their effective mode index shown in Table 1.…”

Section: Eml N supporting

confidence: 65%

“…These spatial profiles of the TM modes are calculated based on the boundary mode analysis performed by a commercial software of COMSOL Multiphysics [32]. The validity of the calculated eigenvalues and eigenfunctions obtained by the boundary mode analysis is confirmed through the agreement of the calculation results obtained by our homemade simulation code based on the transfer matrix method-based waveguide analysis of the OLED [21,33]. As shown in Figure 3, all TM modes are closely confined near the Ag metal/organic interfaces, which shows a typical characteristic of SP modes.…”

Section: Calculation Resultsmentioning

confidence: 95%

“…According to the analytical technique to identify planar WG and SP modes in OLEDs, the spectral responses of the SP-like TM modes can be approximated by the summation of the respective Lorentzian line shape function [21,34]…”

Section: Tm0 Tm1 Tm2mentioning

confidence: 99%

“…It was theoretically demonstrated that the NF absorption significantly contributed to the power dissipation spectrum at a large in-plane wave vector. Recently, we quantified the excitation efficiency of the respective WG and SP modes in a bottom-emitting OLED, where the power dissipation spectrum was approximated by the summation of Lorentzian line shape functions [21]. It was found that the contribution of the SP modes fitted by the Lorentzian line shape functions was not enough at larger in-plane wave vectors.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Theoretical Modeling and Analysis of the Contribution of the Near-Field Absorption to the Dipole Radiation Power in Top-Emitting Organic Light-Emitting Diodes

Kim

2021

Applied Sciences

Self Cite

View full text Add to dashboard Cite

We theoretically model the near-field (NF) absorption for a multilayer micro-cavity (MMC) structure and investigate the contribution of the NF absorption to the dipole radiation power in top-emitting organic light-emitting diodes (OLEDs). The NF absorption occurs due to the interaction between an evanescent wave with a large in-plane wave vector and a planar metal layer in the vicinity of the dipole radiation. The analytical expressions of the NF absorption in the MMC structure are derived from the plane wave expansions of the electric field amplitude, which includes the two-beam and multi-beam interference terms. The transverse magnetic polarization light emitted by both horizontally and vertically oriented dipole emitters is considered in the NF absorption while the contribution of the transverse electric polarization light is neglected. Based on the total spectral power density calculated in a top-emitting OLED, the respective spectral response functions of surface plasmon (SP) modes and NF absorption are compared, where the summation of the Lorentzian line shape functions is used to represent spectral responses of SP modes. At large values of in-plane wave vectors, the spectral response caused by the NF absorption becomes significant and approaches the total spectral power density. In addition, the relative optical powers from various dipole dissipation mechanisms are calculated with respect to the dipole emitter position in the emission layer (EML), which shows the optical power coupled to the NF absorption is predominant over other mechanisms when the distance between the dipole emitter and the EML/Ag interface is less than 10 nm in the top-emitting OLED.

show abstract

“…, which also confirms that all the TM modes in this top-emitting OLED structure are SP mode-like confined mode [21]. .…”

Section: Eml N supporting

confidence: 74%

Section: Eml N supporting

confidence: 65%

Section: Calculation Resultsmentioning

confidence: 95%

Section: Tm0 Tm1 Tm2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Theoretical Modeling and Analysis of the Contribution of the Near-Field Absorption to the Dipole Radiation Power in Top-Emitting Organic Light-Emitting Diodes

Kim

2021

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

Flexible Tandem White Organic Light‐Emitting Devices with Over 46% External Quantum Efficiency via Integrating Efficient Light Outcoupling Structures

Wang,

Chen,

Wang

et al. 2024

Adv Materials Technologies

View full text Add to dashboard Cite

Flexible organic light‐emitting devices (OLEDs) are emerging as a cutting‐edge technology that revolutionizes displays and lighting panels to be lightweight, bendable, foldable, and even stretchable. However, they suffer from the poor light outcoupling efficiency due to the presence of various optical losses. Herein, a novel method of optical manipulation is proposed, which involves incorporating light‐scattering titanium oxide (TiO2) nanoparticles (NPs) into flexible substrates, along with imprinting random micro‐lens arrays (RMLA) at the bottom of the substrates. Adopting the light outcoupling structures, the flexible single white OLEDs demonstrate a substantial improvement of 95.6% in the external quantum efficiency (EQE) compared to conventional flexible OLEDs, while maintaining a desirable spectral profile without any distortion. To further improve the optoelectronic performance, the light outcoupling structures are adopted in flexible tandem white OLEDs with two emission units, the maximum current efficiency is 147.8 cd A−1, and the maximum EQE comes to 46.2%, which is 1.74 times higher than that of the flexible single OLEDs with the same light outcoupling structures. This work offers a convenient way to design flexible light extraction substrates for efficient wearable electronics.

show abstract

Organic Photoplethysmography Sensor Based on Directional Emission Microcavity Organic Light‐Emitting Device

Zhu,

Yu,

Zhang

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Wearable photoplethysmography (PPG) sensors provide real‐time monitoring of essential human health parameters by integrating a light source with a photodetector. However, they face a common challenge: the presence of a faint pulsating (AC) signal amidst a highly noisy and drifting non‐pulsatile background. This necessitates fine‐tuning how the light is spread out to make sure that a significant number of emitted photons carry vital physiological information and trigger the detector's photocurrent. An innovative organic PPG sensor with a microcavity organic light‐emitting diode (OLED) that emits light in a controlled direction, coupled with an annular organic photodetector (OPD) is demonstrated here. By adjusting the OLED's cavity lengths, the microcavity resonance peak is shifted, achieving angled directional emission. Placing the microcavity OLEDs at the center of the annular OPD enhances the portion of light that reflects from arterial vessels in the skin and tissues. This increases the AC signal for recording arterial vessel pulsations by 47.66%. This advancement simplifies sensor recognition and achieves an unprecedented low power consumption of only 9.96 µW for heart rate sensing, meeting essential recognition criteria.

show abstract

Theoretical comparison of the excitation efficiency of waveguide and surface plasmon modes between quantum-mechanical and electromagnetic optical models of organic light-emitting diodes

Cited by 6 publications

References 33 publications

Theoretical Modeling and Analysis of the Contribution of the Near-Field Absorption to the Dipole Radiation Power in Top-Emitting Organic Light-Emitting Diodes

Theoretical Modeling and Analysis of the Contribution of the Near-Field Absorption to the Dipole Radiation Power in Top-Emitting Organic Light-Emitting Diodes

Flexible Tandem White Organic Light‐Emitting Devices with Over 46% External Quantum Efficiency via Integrating Efficient Light Outcoupling Structures

Organic Photoplethysmography Sensor Based on Directional Emission Microcavity Organic Light‐Emitting Device

Contact Info

Product

Resources

About