An organic light-emitting device with ultrathin quantum-well structure as light emitting layer

Zhong, Jiasong; Gao, Juan; Gao, Zhuo; Ke, Dan; Chen, Jiule

doi:10.1007/s10043-011-0075-2

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…The broad EL spectrum of Device II (without MQW) can be attributed to the charge-transfer excited state properties of conventional TADF emitters. By contrast, in the case of Device I (with MQW), the excitons from the quantized energy states in QWs cause narrowing of the EL spectrum [ 55 ]. These results indicate that combining the QW structure with a microcavity-suppressing electrode improved the color purity of the fabricated OLEDs.…”

Section: Resultsmentioning

confidence: 99%

Cavity-Suppressing Electrode Integrated with Multi-Quantum Well Emitter: A Universal Approach Toward High-Performance Blue TADF Top Emission OLED

et al. 2022

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A novel device structure for thermally activated delayed fluorescence (TADF) top emission organic light-emitting diodes (TEOLEDs) that improves the viewing angle characteristics and reduces the efficiency roll-off is presented. Furthermore, we describe the design and fabrication of a cavity-suppressing electrode (CSE), Ag (12 nm)/WO3 (65 nm)/Ag (12 nm) that can be used as a transparent cathode. While the TADF-TEOLED fabricated using the CSE exhibits higher external quantum efficiency (EQE) and improved angular dependency than the device fabricated using the microcavity-based Ag electrode, it suffers from low color purity and severe efficiency roll-off. These drawbacks can be reduced by using an optimized multi-quantum well emissive layer (MQW EML). The CSE-based TADF-TEOLED with an MQW EML fabricated herein exhibits a high EQE (18.05%), high color purity (full width at half maximum ~ 59 nm), reduced efficiency roll-off (~ 46% at 1000 cd m−2), and low angular dependence. These improvements can be attributed to the synergistic effect of the CSE and MQW EML. An optimized transparent CSE improves charge injection and light outcoupling with low angular dependence, and the MQW EML effectively confines charges and excitons, thereby improving the color purity and EQE significantly. The proposed approach facilitates the optimization of multiple output characteristics of TEOLEDs for future display applications.

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Section: Resultsmentioning

confidence: 99%

Cavity-Suppressing Electrode Integrated with Multi-Quantum Well Emitter: A Universal Approach Toward High-Performance Blue TADF Top Emission OLED

et al. 2022

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“…Thus the charge carrier recombination efficiency and exciton formation probability can be beneficially enhanced [19]. The organic molecules were insufficiently restricted by Van to carrier confinement have been proved to achieve better device performance such as high luminous efficiency, [20], tunable EL zone [21], and carrier balance resulting in the enhanced exciton creations in the emitting region [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers

et al. 2015

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“…The organic molecules were insufficiently restricted by Van der Waals force among molecules in the organic quantum well. The main features of QWS were high electroluminescence (EL) efficiency [ 18 ], tunable EL zone [ 19 ], and great carrier balance [ 20 - 23 ].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient blue organic light-emitting diodes using quantum well-like multiple emissive layer structure

Yoon

Kim

et al. 2014

Nanoscale Res Lett

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In this study, the properties of blue organic light-emitting diodes (OLEDs), employing quantum well-like structure (QWS) that includes four different blue emissive materials of 4,4′-bis(2,2′-diphenylyinyl)-1,1′-biphenyl (DPVBi), 9,10-di(naphth-2-yl)anthracene (ADN), 2-(N,N-diphenyl-amino)-6-[4-(N,N-diphenyl amine)styryl]naphthalene (DPASN), and bis(2-methyl-8-quinolinolate)-4-(phenyl phenolato) aluminum (BAlq), were investigated. Conventional QWS blue OLEDs composed of multiple emissive layers and charge blocking layer with lower highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy level, and devices with triple emissive layers for more significant hole-electron recombination and a wider region for exciton generation were designed. The properties of triple emissive layered blue OLEDs with the structure of indium tin oxide (ITO) /N,N′-diphenyl-N,N′-bis(1-naphthyl-phenyl)-(1,1′-biphenyl)-4,4′-diamine (NPB) (700 Ǻ)/X (100 Ǻ)/BAlq (100 Ǻ)/X (100 Ǻ)/4,7-diphenyl-1,10-phenanthroline (Bphen) (300 Ǻ)/lithium quinolate (Liq) (20 Ǻ)/aluminum (Al) (1,200 Ǻ) (X = DPVBi, ADN, DPASN) were examined. HOMO-LUMO energy levels of DPVBi, ADN, DPASN, and BAlq are 2.8 to 5.9, 2.6 to 5.6, 2.3 to 5.2, and 2.9 to 5.9 eV, respectively. The OLEDs with DPASN/BAlq/DPASN QWS with maximum luminous efficiency of 5.32 cd/A was achieved at 3.5 V.

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An organic light-emitting device with ultrathin quantum-well structure as light emitting layer

Cited by 6 publications

References 27 publications

Cavity-Suppressing Electrode Integrated with Multi-Quantum Well Emitter: A Universal Approach Toward High-Performance Blue TADF Top Emission OLED

Cavity-Suppressing Electrode Integrated with Multi-Quantum Well Emitter: A Universal Approach Toward High-Performance Blue TADF Top Emission OLED

Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers

Highly efficient blue organic light-emitting diodes using quantum well-like multiple emissive layer structure

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