Model and simulation on the efficiencies of microcavity OLEDs

Ma, Fang; Su, Jianpo; Mao-tian, Guo; Gong, Qihuang; Duan, Zhiyong; Yang, Jing; Du, Yanli; Yuan, Bin; Liu, Xingyuan

doi:10.1016/j.optcom.2012.02.098

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…The EQE of LP-LEDs (𝜂 ext ) was calculated by using the equation as follows: [25] where N p and N e are the total number of emitted photos and injected electrons, respectively, L is the measured luminance, 𝜆 is the wavelength, I(𝜆) is the relative EL intensity at wavelength 𝜆 according to the EL spectrum, V(𝜆) is the photopic spectral response function, h is the Plank constant, c is the velocity of the light, I e is the measured current, and e is the electronic charge.…”

Section: Methodsmentioning

confidence: 99%

“…The EQE of LP‐LEDs ( η ext ) was calculated by using the equation as follows: [ 25 ]

\begin{eqnarray} {\rm{EQE}} &=& {{{N}_{\rm{p}}} \over {{N}_{\rm{e}}}}\nonumber\\ &=& {{{\rm{\pi }} \times {L \over {\int_{380}^{780} {I\left( \lambda \right) \times V\left( \lambda \right){\rm{d}}\lambda } }} \times \int_{380}^{780} {\left[ {I\left( \lambda \right) \times \lambda } \right]/\left( {683 \times hc} \right){\rm{d}}\lambda } } \over {{I}_{\rm{e}}/e}} \times 100\% \end{eqnarray}

where N p and N e are the total number of emitted photos and injected electrons, respectively, L is the measured luminance, λ is the wavelength, I ( λ ) is the relative EL intensity at wavelength λ according to the EL spectrum, V ( λ ) is the photopic spectral response function, h is the Plank constant, c is the velocity of the light, I e is the measured current, and e is the electronic charge.…”

Section: Methodsmentioning

confidence: 99%

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Highly Efficient Inherent Linearly Polarized Electroluminescence from Small‐Molecule Organic Single Crystals

Jia

Zhang

et al. 2023

Advanced Materials

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Small-molecule organic single crystals (SCs) with an inherent in-plane anisotropic nature enable direct linearly polarized light emission without the need for spatially separated polarizers and complex optical structures. However, the device performance is severely restricted by the starvation of appropriate SC emitters and the difficulty in the construction of efficient SC electroluminescence (EL) devices, leading to a low external quantum efficiency (EQE) of usually smaller than 1.5%. Here, highly efficient inherent linearly polarized light-emitting diodes (LP-LEDs) are demonstrated by exploiting 2,6-diphenylanthracene (DPA) SCs as intrinsically polarized emitters. The LP-LEDs exhibit a 2.5-fold enhanced maximum EQE of 3.38%, which approaches the theoretical limit for the DPA SC-based EL device and is the highest among organic SC-based LEDs reported thus far. More importantly, a high degree of polarization (DOP) up to 0.74 is achieved for the intrinsically polarized EL emission of the DPA SC-based LP-LEDs. By leveraging the highly efficient LP-LED, an interchip polarized optical communication system consisting of organic SCs is demonstrated for the first time. This work creates a solid foundation for the exploitation of a vast new library of small-molecule organic SCs for LP-LEDs and carries broad implications for polarized optics and relevant optoelectronic devices.

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Section: Methodsmentioning

confidence: 99%

“…The EQE of LP‐LEDs ( η ext ) was calculated by using the equation as follows: [ 25 ]

\begin{eqnarray} {\rm{EQE}} &=& {{{N}_{\rm{p}}} \over {{N}_{\rm{e}}}}\nonumber\\ &=& {{{\rm{\pi }} \times {L \over {\int_{380}^{780} {I\left( \lambda \right) \times V\left( \lambda \right){\rm{d}}\lambda } }} \times \int_{380}^{780} {\left[ {I\left( \lambda \right) \times \lambda } \right]/\left( {683 \times hc} \right){\rm{d}}\lambda } } \over {{I}_{\rm{e}}/e}} \times 100\% \end{eqnarray}

Section: Methodsmentioning

confidence: 99%

Highly Efficient Inherent Linearly Polarized Electroluminescence from Small‐Molecule Organic Single Crystals

Jia

Zhang

et al. 2023

Advanced Materials

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“…External Quantum Efficiency Calculation : The EQE value of crystal‐based OLEDs was calculated by using Equation as follows

EQE = \frac{π e}{K_{normalm} h c J} \int_{0}^{\frac{π}{2}} [L_{normalv} (θ) \sin 2 θ \frac{\int λ P (θ, λ) d λ}{\int P (θ, λ) V (λ) d λ}] d θ

where e corresponds to the quantity of the electron charge, K m is a conversion constant based on the maximum sensitivity of the eye (683 lm W −1 ), h is the Planck constant, c is the velocity of the light, J is the measured current density, P ( θ,λ ) is the relative spectral power distribution of the device at viewing angle θ, V (λ) is the normalized photopic spectral response function, and L v (θ) is the spectral luminance at θ .…”

Section: Methodsmentioning

confidence: 99%

Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices

et al. 2018

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Organic single-crystalline semiconductors with long-range periodic order have attracted much attention for potential applications in electronic and optoelectronic devices due to their high carrier mobility, highly thermal stability, and low impurity content. Molecular doping has been proposed as a valuable strategy for improving the performance of organic semiconductors and semiconductor-based devices. However, a fundamental understanding of the inherent doping mechanism is still a key challenge impeding its practical application. In this study, solid evidence for the "perfect" substitutional doping mechanism of the stacking mode between the guest and host molecules in organic single-crystalline semiconductors using polarized photoluminescence spectrum measurements and first-principles calculations is provided. The molecular host-guest doping is further exploited for efficient color-tunable and even white organic single-crystal-based light-emitting devices by controlling the doping concentration. The clarification of the molecular doping mechanism in organic single-crystalline semiconductor host-guest system paves the way for their practical application in high-performance electronic and optoelectronic devices.

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“…External Quantum Efficiency Calculation: The EQE of crystal-based OLEDs ( η ext ) is calculated by using equation (2) as follow 53 : where e corresponds to the quantity of the electron charge, K m is a conversion constant based on the maximum sensitivity of the eye (683 lm W −1 ), h is the Planck constant, c is the velocity of the light, J is the measured current density, P(θ, λ) is the relative spectral power distribution of the device at viewing angle θ corresponding to the EL spectral intensity distribution measured from EL spectra, the EL spectra at current of 778 mA/cm 2 is shown in the inset of Supplementary Figure S2b , V(λ) is the normalized photopic spectral response function, and L v (θ) is the spectral luminance at θ.…”

Section: Methodsmentioning

confidence: 99%

Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices

Ding

Feng

Zhou

et al. 2015

Sci Rep

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A single crystal-based organic light-emitting device (OLED) with intrinsically polarized and color-tunable electroluminescence (EL) has been demonstrated without any subsequent treatment. The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained. The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

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Model and simulation on the efficiencies of microcavity OLEDs

Cited by 11 publications

References 10 publications

Highly Efficient Inherent Linearly Polarized Electroluminescence from Small‐Molecule Organic Single Crystals

Highly Efficient Inherent Linearly Polarized Electroluminescence from Small‐Molecule Organic Single Crystals

Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices

Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices

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