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N,N′-Bis(3-methylphenyl)-N,N′-dyphenylbenzidine Based Distributed Feedback Lasers with Holographically Fabricated Polymeric Resonators
- Source :
- Polymers, Vol 13, Iss 3843, p 3843 (2021), Polymers, RUA. Repositorio Institucional de la Universidad de Alicante, Universidad de Alicante (UA), Volume 13, Issue 21
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The molecule N,N′-bis(3-methylphenyl)-N,N′-dyphenylbenzidine (TPD) has been widely used in optoelectronic applications, mainly for its hole-transporting properties, but also for its capability to emit blue light and amplified spontaneous emission, which is important for the development of organic lasers. Here, we report deep-blue-emitting distributed feedback (DFB) lasers based on TPD dispersed in polystyrene (PS), as active media, and dichromated gelatin layers with holographically engraved relief gratings, as laser resonators. The effect of the device architecture (with the resonator located below or on top of the active layer) is investigated with a dye (TPD) that can be doped into PS at higher rates (up to 60 wt%), than with previously used dyes (&lt<br />5 wt%). This has enabled changing the index contrast between film and resonator, which has an important effect on the laser performance. With regards to thresholds, both architectures behave similarly for TPD concentrations above 20 wt%, while for lower concentrations, top-layer resonator devices show lower values (around half). Remarkably, the operational durability of top-layer resonator devices is larger (in a factor of around 2), independently of the TPD concentration. This is a consequence of the protection offered by the resonator against dye photo-oxidation when the device is illuminated with pulsed UV light.
- Subjects :
- polymer films
Física de la Materia Condensada
Polymers and Plastics
Polymer films
Organic chemistry
laser threshold
photostability
Article
law.invention
Resonator
QD241-441
law
Física Aplicada
Organic distributed feedback laser
Laser threshold
Óptica
Physics
business.industry
organic distributed feedback laser
General Chemistry
Laser
Photostability
Optoelectronics
Christian ministry
business
Subjects
Details
- Language :
- English
- ISSN :
- 20734360
- Volume :
- 13
- Issue :
- 3843
- Database :
- OpenAIRE
- Journal :
- Polymers
- Accession number :
- edsair.doi.dedup.....d58e2d23009d7fa9bab35c8cd95af289