Thermally activated delayed fluorescence‐based tandem OLEDs with very high external quantum efficiency

Huang, Chen-Chao; Xie, Yue‐Min; Wu, Shengfan; Li, Sihua; Liang, Jie; Fung, Man‐Keung

doi:10.1002/pssa.201700240

Cited by 12 publications

(9 citation statements)

References 21 publications

(20 reference statements)

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“…This indicated that the addition of ampicillin (25%) enhanced the efficiency by at least 4-6% in addition to the EML efficiency, thus delivering one of the top device performances. 32,33,38 The variable-angle performance (shown as inset in Fig. 5c) demonstrated that including 25% ampicillin-PEDOT:PSS device, all OLED devices (solid colored lines) presented near-perfect Lambertian emission compared with the simulated ideal (dotted line) curve.…”

Section: Concentration-dependent Chemical Interactions Of Ampicillinmentioning

confidence: 95%

“…Efficient light emission in an OLED is possible through charge (electron-hole) balance, by avoiding the recombination near the electrodes and confining within the EML. 32,33,38 The device without ampicillin showed a low CE of~48 cd A −1 . This is because the electron injection/mobility in CBP + Ir(ppy) 3 based EML through electron transport layer (ETL) is weaker than the hole injection/mobility from PEDOT:PSS.…”

Section: Concentration-dependent Chemical Interactions Of Ampicillinmentioning

confidence: 96%

“…In terms of enhancements in device performance of green OLEDs to date, Huang et al 32 reported an external quantum efficiency (EQE) of 32.5% and a current efficiency (CE) of 117.5 cd A −1 in a tandem structure. Xu, et al 33 reported a maximum EQE of 36.85% and CE of 135.74 cd A −1 also in a tandem structure.…”

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confidence: 99%

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The effect of introducing antibiotics into organic light-emitting diodes

et al. 2019

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The quest to improve the performance of organic light-emitting diodes (OLEDs) has led to the exploration of new materials with properties like interfacial dipole, excitons generation, and bandgap alignment. Here, we exploit these strategies by investigating the interaction of the antibiotic ampicillin with a widely used optoelectronic material, to fabricate state-of-theart OLEDs. The charge distribution on the ampicillin molecule facilitates the generation of an interfacial dipole with a large magnitude. The optimum fusion of the two materials provides an enhanced bandgap alignment, charge balance and J/H-aggregated excitons. Values of current efficiency (120 cdA −1), external quantum efficiency (~35%) and power efficiency (70 lmW −1) are demonstrated. The cross-evaluation of performance with penicillin devices indicates the significance of ampicillin's specific molecular structure in improving performance. The detailed investigations demonstrate that ampicillin has superior optoelectronic properties with high potential to contribute extensively in OLEDs and photovoltaics.

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Section: Concentration-dependent Chemical Interactions Of Ampicillinmentioning

confidence: 95%

Section: Concentration-dependent Chemical Interactions Of Ampicillinmentioning

confidence: 96%

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The effect of introducing antibiotics into organic light-emitting diodes

et al. 2019

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“…[22] Our group also reported the first TADF-based hybrid tandem WOLED with a maximum current efficiency and EQE of 78.5 cd A −1 and 28.5%, respectively. [23] Despite these findings, WOLEDs with high efficiency and long lifetime simultaneously at a practical luminance (let say 1000 cd m −2 ) have been rarely reported by tailored device design to maximize the utilization of triplet excitons.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Tandem White OLED with Long Lifetime and 150 Lm W⁻¹ in Luminous Efficacy Based on TADF Blue Emitter Stabilized with Phosphorescent Red Emitter

Huang

Zhang

Zhou

et al. 2020

Advanced Optical Materials

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Modern lighting requires high efficiency and long lifetime simultaneously. In this paper, highly efficient white organic light emitting diodes (WOLEDs) are demonstrated based on a modified hybrid tandem structure constructed with a phosphorescent yellow‐red unit using an exciplex host and a blue‐red unit based on a thermally activated delayed fluorescence (TADF) blue emitter, and the devices are properly built with internal and external light extraction structures. The resulting four‐color WOLED exhibits an external quantum efficiency and luminous efficacy of 126.2% and 150.7 Lm W−1, respectively, and the color rendering index is close to 80 at a brightness of 1000 cd m−2. This device also shows a very good color stability with increasing luminance up to 15 000 cd m−2 and there is only a small angular color variation for viewing angles changing from 0° to 70°. The T50 lifetime (defined as the time corresponding to 50% decrease in luminance from an initial value) of the WOLED at an initial luminance of 1000 cd m−2 is extrapolated as 12 600 h.

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“…Also, it offers other distinct features, such as UV/IR/glare free, color tunability, and a high color rendering index. Furthermore, in contrast to their inorganic counterpart, OLEDs enable the production of large‐area flat panel lighting without any light distribution element …”

Section: Introductionmentioning

confidence: 99%

Smart OLED Lighting on Electrochromic Glass

Liu

et al. 2018

Physica Status Solidi (a)

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Smart organic light‐emitting diodes (OLEDs) prepared on poly(3,4‐ethylenedioxythiophene) (PEDOT)‐based electrochromic glass is demonstrated for the first time. In this work, electrochromic glass based on PEDOT is adopted as a substrate for OLED and used for tuning the light‐emitting direction. The color of the glass changes from pale blue to dark blue upon the application of an external voltage. The coloration or discoloration is due to reaction of the redox solution with PEDOT. Therefore, the utilization of this coloration or discoloration of the glass substrate can adjust the light‐emitting direction of OLED. When the glass is tuned to semi‐transparent, it causes the dual‐side emitting device to display a graceful spatial impression. When the glass becomes highly opaque, the device exhibits top emission with a significantly enhanced luminance efficiency, in which the current efficiencies can be increased twice compared with those when the smart glass was switched off. For the green device, the current efficiency increases from 9.5 to 19.0 cd A−1. For the white device, it increases from 7.5 to 15.5 cd A−1. The authors believe that the combination of smart glass and OLED is a new concept for future OLED lighting applications.

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Thermally activated delayed fluorescence‐based tandem OLEDs with very high external quantum efficiency

Cited by 12 publications

References 21 publications

The effect of introducing antibiotics into organic light-emitting diodes

The effect of introducing antibiotics into organic light-emitting diodes

Hybrid Tandem White OLED with Long Lifetime and 150 Lm W⁻¹ in Luminous Efficacy Based on TADF Blue Emitter Stabilized with Phosphorescent Red Emitter

Smart OLED Lighting on Electrochromic Glass

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Thermally activated delayed fluorescence‐based tandem OLEDs with very high external quantum efficiency

Cited by 12 publications

References 21 publications

The effect of introducing antibiotics into organic light-emitting diodes

The effect of introducing antibiotics into organic light-emitting diodes

Hybrid Tandem White OLED with Long Lifetime and 150 Lm W−1 in Luminous Efficacy Based on TADF Blue Emitter Stabilized with Phosphorescent Red Emitter

Smart OLED Lighting on Electrochromic Glass

Contact Info

Product

Resources

About

Hybrid Tandem White OLED with Long Lifetime and 150 Lm W⁻¹ in Luminous Efficacy Based on TADF Blue Emitter Stabilized with Phosphorescent Red Emitter