Solid-state lighting
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Solid-state lighting (SSL) refers to a type of lighting that uses semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma (used in arc lamps such as fluorescent lamps), or gas.[citation needed]
The term "solid state" refers commonly to light emitted by solid-state electroluminescence, as opposed to e.g. incandescent bulbs (which use thermal radiation) or fluorescent tubes. Compared to incandescent lighting, SSL creates visible light with reduced heat generation or parasitic energy dissipation. Even conventional fluorescent lamps are essentially solid state light sources, as most light is generated in the solid state fluorescent coating of the tube. Conventional incandescent light bulbs are essentially solid state light sources too, as light is generated in the solid state tungsten filament. The distinction is even more blurry in the case of most common "white" LEDs which convert blue light to an (approximate) white light spectrum using photoluminescence, the same principle used in conventional fluorescent tubes.
The typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the lifespan of the illumination device.
Solid-state lighting is often used in traffic lights and is also used frequently in modern vehicle lights, train marker lights, remote controls etc.
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[edit] External links
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Wikimedia Commons has media related to: LED lamps |
- DOE SSL roadmap
- Solid State Lighting Design
- Solid State Lighting.org
- The Promise and Challenge of Solid-State Lighting
- Lighting Research Center - Solid-State Lighting Program
- OLLA: finished european academic-industrial research project into OLED lighting
- OLED100.EU: succesor to the OLLA project
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