NDLI: EL emission enhancement in powder electroluminescent device via insertion of receptive layer

Content Provider	IET Digital Library
Author	Takeda, N. Tsuneyasu, S. Satoh, T.
Abstract	A method to enhance the electroluminescence (EL) of powder electroluminescent devices via the insertion of a receptive layer between the letter substrate and the transparent electrode is proposed. This approach affords uniformity of distance between the substrate and electrode, which ensures a more uniform electric field on application of a voltage to the device. Both the current and luminance are observed to increase, and the device capacitance and capacitive reactance improve on introduction of the receptive layer, which enhances the EL properties. The emission-enhancement mechanism is examined via measurements of the frequency dependence of the current, luminance, and loss tangent tan δ. Regardless of the receptive layer, the current decreases in the frequency regime over which tan δ increases, which indicates that the EL properties are affected by electrical energy losses due to dielectric loss. The frequency-dependence behaviours of tan δ and temperature are found to be different because of heat production due to both dielectric loss and radiationless deactivation, which means that dielectric loss must be reduced to improve device efficiency. Their approach can form an integral aspect of the evaluation of powder electroluminescent devices.
Starting Page	144
Ending Page	147
Page Count	4
ISSN	00135194
Volume Number	56
e-ISSN	1350911X
Issue Number	Issue 3, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/56/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2019.3085
Journal	Electronics Letters
Publisher Date	2019-11-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Brightness Current Luminance Device Capacitance Device Efficiency Dielectric Loss Dielectric Permittivity EL Emission Enhancement EL Property Electrical Energy Loss Electrode Electroluminescence Electroluminescent Device Emission-enhancement Mechanism Frequency Dependence Frequency-dependence Letter Substrate Loss Tangent Tan Method of Nanofabrication And Processing Photonic Technology Powder Powder EL Device Powder Electroluminescent Device Receptive Layer Transparent Electrode Uniform Electric Field
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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