Bright Stretchable White Alternating‐Current Electroluminescent Devices Enabled by Photoluminescent Phosphor

Zhao, Changbin; Yang, Biao; Ali, Muhammad Umair; Zhao, Yiqian; Zhang, Chaohong; Yin, Yujing; Liu, Ming; Yan, Chaoyi; Meng, Hong

doi:10.1002/admt.202101440

Cited by 9 publications

(5 citation statements)

References 50 publications

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“…Figure c displays the layer-by-layer stacking structure of the device. Under an alternating electric field, metal-doped ZnS phosphor emits light due to the radiative relaxation of luminescent centers Figure d presents the luminescence images of the flexible luminescent devices using MrGO-CEL composites obtained by impregnating MGO 2, 4, 6, 8, 10, and 12 times as electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…Under an alternating electric field, metal-doped ZnS phosphor emits light due to the radiative relaxation of luminescent centers. 36 Figure 2d presents the luminescence images of the flexible luminescent devices using MrGO-CEL composites obtained by impregnating MGO 2, 4, 6, 8, 10, and 12 times as electrodes. As the resistance of the bottom electrode gradually decreases, the luminescence intensity of the device increases.…”

Section: Morphological Analysis Of Mrgo-celmentioning

confidence: 99%

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Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Zhi,

Xu,

et al. 2023

ACS Appl. Nano Mater.

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Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.

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Section: Resultsmentioning

confidence: 99%

Section: Morphological Analysis Of Mrgo-celmentioning

confidence: 99%

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Zhi,

Xu,

et al. 2023

ACS Appl. Nano Mater.

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“…With the emergence of the internet of things, there is an increasing demand for interactive wearable display devices. − The popularity of devices like smartwatches and smart glasses continues enhance our interaction with the world. , Electroluminescent (EL) devices, as the foundation of wearable displays, have been a focus in recent decades. − Among these, alternative current electroluminescence|alternative current electroluminescent (ACEL) devices can avoid the charge accumulation caused by unidirectional current, leading the improvement on the power efficiency and operational lifetime. − Moreover, ACEL devices are less sensitive to size variations, which simplifies their application in flexible devices. ,, Numerous flexible displays based on the ACEL technology have been reported, demonstrating their potential in applications such as flexible displays and strain sensors. − …”

Section: Introductionmentioning

confidence: 99%

Low Driving Voltage Electroluminescence Device for Integrated Visual Strain Sensing

Zhu,

Xiong,

et al. 2024

ACS Appl. Mater. Interfaces

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As a pivotal component in human−machine interactions, display devices have undergone rapid development in modern life. Displays such as alternative current electro-luminescence|alternative current electroluminescent (ACEL) devices with high flexibility and long operational lifetimes are essential for wearable electronics. However, ACEL devices are constrained by their inherent high driving voltage and complex fabrication processes. Our work presents an easy blade-coating method for fabricating flexible ACEL display devices based on an all-solution process. By dispersing BaTiO 3 and ZnS/Cu powder into waterborne polyurethane, we successfully combined dielectric and fluorescence functionalities within a single layer, significantly reducing the device's driving voltage. Additionally, the ionic conducting hydrogel was chosen as a transparent electrode to achieve good electrical contact and strong interfacial adhesion through in situ polymerization. Owing to the unique method, our ACEL device exhibits high flexibility, low driving voltage (20−100 V), high brightness (300+ cd/m 2 at 60 V), and environmental friendliness. Furthermore, by repurposing the hydrogel electrode, we integrated strain visualization capabilities within a single device, highlighting its potential for applications such as wearable healthcare monitoring.

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“…Moreover, the luminescence intensity of the device showed an exponential growth trend with increasing voltage and frequency, similar to that of the single Z layer device due to the Z-to-C energy transfer mechanism (Figures S12). − Notably, the emission peak of ZnS:Cu showed a blue shift with increasing frequency due to the peculiarity of the ZnS:Cu energy level structure, which comprises two different acceptor states . This effect permits additional control over the color output of the device (Figure S13).…”

mentioning

confidence: 99%

Solid-State Displacement Synthesis of Alkaline-Earth Selenide for White Emission through Alternating Current Electroluminescence

Wang

Suo

Zhang

et al. 2022

ACS Materials Lett.

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Alkaline-earth selenides (AESe) are functional materials of both fundamental and technological importance, but their chemical synthesis has met with limited success. Herein, a solid-state displacement reaction is described for the rapid synthesis of various AESe crystals without the need for hazardous chemicals. The reaction mechanism is studied by careful control of the experimental variables such as the reaction temperature (800−1400 °C), atmospheres (air, N 2 , and N 2 /H 2 mixture), and Se precursors (ZnSe and Se). Using AECO 3 and ZnSe (ZnS) as precursor materials under N 2 /H 2 mixture atmosphere, we synthesized a series of AESe, AES, and AE(S,Se) crystals with high crystallinities. Doping of luminescent lanthanide ions such as Eu 2+ is concomitantly achieved during the synthesis, yielding tunable photoluminescence that is useful for constructing white light-emitting devices in combination with electroluminescent ZnS:Cu.

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Bright Stretchable White Alternating‐Current Electroluminescent Devices Enabled by Photoluminescent Phosphor

Cited by 9 publications

References 50 publications

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Low Driving Voltage Electroluminescence Device for Integrated Visual Strain Sensing

Solid-State Displacement Synthesis of Alkaline-Earth Selenide for White Emission through Alternating Current Electroluminescence

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