Simulations of emission from microcavity tandem organic light-emitting diodes

Biswas, Rana; Xu, Chun; Zhao, Weijun; Li, Rui; Shinar, Ruth; Shinar, J.

doi:10.1117/1.3552947

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…Vol. :(0123456789) To fabricate a device with the desired wavelength, it is crucial to find the thickness of the organic layer where 2nd-order cavities occur [45][46][47][48] . Through optical simulation, the thicknesses of (MoO 3 + NPB) serving as a hole transport layer (HTL) and Alq 3 serving as an electron transport layer (ETL) were calculated where the 2nd-order cavities occurred, as shown in Fig.…”

Section: Fabrication Of Microcavity Tandem Nir Oledmentioning

confidence: 99%

Cell proliferation effect of deep-penetrating microcavity tandem NIR OLEDs with therapeutic trend analysis

Park

Choi

Jeon

et al. 2022

Sci Rep

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Long wavelengths that can deeply penetrate into human skin are required to maximize therapeutic effects. Hence, various studies on near-infrared organic light-emitting diodes (NIR OLEDs) have been conducted, and they have been applied in numerous fields. This paper presents a microcavity tandem NIR OLED with narrow full-width half-maximum (FWHM) (34 nm), high radiant emittance (> 5 mW/cm2) and external quantum efficiency (EQE) (19.17%). Only a few papers have reported on biomedical applications using the entire wavelength range of the visible and NIR regions. In particular, no biomedical application studies have been reported in the full wavelength region using OLEDs. Therefore, it is worth researching the therapeutic effects of using OLED, a next-generation light source, and analyzing trends for cell proliferation effects. Cell proliferation effects were observed in certain wavelength regions when B, G, R, and NIR OLEDs were used to irradiate human fibroblasts. The results of an in-vitro experiment indicated that the overall tendency of wavelengths is similar to that of the cytochrome c oxidase absorption spectrum of human fibroblasts. This is the first paper to report trends in the cell proliferation effects in all wavelength regions using OLEDs.

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Section: Fabrication Of Microcavity Tandem Nir Oledmentioning

confidence: 99%

Cell proliferation effect of deep-penetrating microcavity tandem NIR OLEDs with therapeutic trend analysis

Park

Choi

Jeon

et al. 2022

Sci Rep

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Tunable Near UV Microcavity OLED Arrays: Characterization and Analytical Applications

Manna

Fungura

Biswas

et al. 2015

Adv Funct Materials

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A new approach is demonstrated to fabricate narrow‐band emission near‐UV microcavity OLEDs (μcOLEDs) with peak emission at ≈385 nm, in near‐perfect alignment with the narrow primary 385 nm absorption band of Pt octaethylporphyrin dye, using 4,4′‐bis(9‐carbazolyl)‐1,1′‐biphenyl (CBP) as the emissive layer. Although OLEDs have been extensively operated at optical wavelengths, only few have achieved near‐UV emission. Yet there is a growing need for portable compact narrow‐band near UV sources for many biomedical and forensic applications. A microcavity effect, due to metallic electrodes enclosing an optical cavity, is employed to achieve the desired narrow peak emission. An Al/Pd bi‐layer anode enables attaining a turn on voltage of 3.8 V and a 4,4′‐cyclohexylidenebis [N,N‐bis (4‐methylphenyl) benzenamine] (TAPC) layer improves electron‐hole recombination in the emissive layer. The fabricated μcOLED is efficiently used as the excitation source in a structurally integrated all‐organic oxygen sensor. Moreover, a CBP‐based combinatorial array of μcOLED pixels is fabricated by varying the thickness of the organic layers to obtain nine sharp, discrete emission peaks from 370 to 430 nm, employed in an all‐organic on‐chip spectrophotometer. The photodetectors are based on P3HT:PCBM (poly(3‐hexylthiophene):[6,6]‐phenyl‐C60‐butyric acid methyl ester) or the more sensitive PTB7:PCBM (PTB7 is polythieno [3,4‐b]‐thiophene‐co‐benzodithiophene). Simulations of the OLEDs' emission are used for analysis of the experimental data, assisting in device fabrication.

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Extremely Efficient Indium–Tin‐Oxide‐Free Green Phosphorescent Organic Light‐Emitting Diodes

et al. 2012

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This paper demonstrates extremely efficient (η(P,max) = 118 lm W(-1) ) ITO-free green phosphorescent OLEDs (PHOLEDs) with multilayered, highly conductive poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) films as the anode. The efficiency is obtained without any outcoupling-enhancing structures and is 44% higher than the 82 lm W(-1) of similar optimized ITO-anode PHOLEDs. Detailed simulations show that this improvement is due largely to the intrinsically enhanced outcoupling that results from a weak microcavity effect.

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Simulations of emission from microcavity tandem organic light-emitting diodes

Cited by 6 publications

References 21 publications

Cell proliferation effect of deep-penetrating microcavity tandem NIR OLEDs with therapeutic trend analysis

Cell proliferation effect of deep-penetrating microcavity tandem NIR OLEDs with therapeutic trend analysis

Tunable Near UV Microcavity OLED Arrays: Characterization and Analytical Applications

Extremely Efficient Indium–Tin‐Oxide‐Free Green Phosphorescent Organic Light‐Emitting Diodes

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