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Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Updated: May 2, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

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Published on: November 15, 2016

White polymer light-emitting devices for solid-state lighting: materials, devices, and recent progress.

Lei Ying¹, Cheuk-Lam Ho, Hongbin Wu

¹Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|March 18, 2014

Summary

This summary is machine-generated.

White polymer light-emitting devices (WPLEDs) offer a cost-effective and eco-friendly alternative for solid-state lighting. Recent advancements in WPLEDs now rival the efficiency and stability of fluorescent lamps, making them competitive for illumination.

Keywords:

White polymer light-emitting materials and devices fluorescence illumination phosphorescence white light

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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

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Published on: November 16, 2018

Area of Science:

Materials Science
Optoelectronics
Solid-State Lighting

Background:

White polymer light-emitting devices (WPLEDs) are gaining interest due to advantages like low cost, light weight, and ease of fabrication.
Lighting accounts for approximately 20% of global electricity consumption, highlighting the need for efficient lighting solutions.
Incandescent bulbs are inefficient, and fluorescent lamps contain toxic mercury, creating demand for safer, more efficient alternatives.

Purpose of the Study:

To summarize recent advancements in WPLED technology.
To highlight the role of novel luminescent dopants and device structures in improving WPLED performance.
To assess the competitiveness of WPLEDs against existing lighting technologies.

Main Methods:

Review of recent scientific literature on WPLEDs.
Analysis of novel luminescent dopant designs.
Examination of advanced WPLED device structures.
Performance comparison with fluorescent lamps, inorganic LEDs, and small-molecular devices.

Main Results:

WPLEDs have demonstrated performance efficiencies comparable to fluorescent lamps.
Advancements in dopants and structures have significantly improved WPLED efficiency and stability.
WPLEDs are closing the performance gap with established lighting technologies.

Conclusions:

WPLEDs are becoming increasingly competitive for illumination purposes.
Further development in luminescent materials and device engineering is key to WPLED advancement.
WPLEDs present a promising, environmentally friendly lighting solution.