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Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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Related Experiment Video

Updated: Feb 18, 2026

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter

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Incorporating High-Dielectric-Constant Modified PVDF Into Alternating Current Electroluminescent Fibers to Boost

Renqian Hu¹, Peiyu Liu¹, Xiaokun Wang¹

¹State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, China.

|February 17, 2026

Summary

Researchers developed a high-dielectric-constant polymer for alternating current electroluminescent (ACEL) fibers, significantly boosting brightness for electronic textiles. This innovation overcomes limitations in current wearable display technologies.

Keywords:

dielectric polymer electroluminescence fibers electronic textiles high brightness

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Area of Science:

Materials Science
Polymer Chemistry
Optoelectronics

Background:

Alternating current electroluminescent (ACEL) fibers are key for wearable tech displays.
Current ACEL fibers suffer from low luminous brightness (<200 cd/m²), limiting applications.
Low dielectric constant of polymer matrices is a primary cause of limited brightness.

Purpose of the Study:

To develop a novel polymer matrix for ACEL fibers to enhance luminous brightness.
To create a solution-processable, high-dielectric-constant material compatible with ACEL fiber fabrication.
To demonstrate the practical applicability of enhanced ACEL fibers in electronic textiles.

Main Methods:

Synthesis of a modified poly(vinylidene fluoride-co-chlorotrifluoroethylene) (M-PVDF) with a high dielectric constant.
Integration of M-PVDF into a multilayer coaxial structure for ACEL fiber fabrication.
Characterization of ACEL fiber performance, including brightness, stability, and flexibility.

Main Results:

The M-PVDF matrix achieved a high dielectric constant, enabling high brightness.
ACEL fibers using M-PVDF reached 717 cd/m² brightness at 110 V and 2 kHz, a significant improvement.
The fibers demonstrated excellent stability under thermal stress, friction, and washing, along with large-scale production uniformity.

Conclusions:

The developed M-PVDF matrix is a viable solution for manufacturing high-performance ACEL fibers.
Enhanced ACEL fibers offer superior brightness and durability for advanced wearable electronic textiles.
These fibers hold potential for diverse applications in illuminated textiles and interactive displays.