Organic films deposited on Sip‐njunctions: Accurate measurements of fluorescence internal efficiency, and application to luminescent antireflection coatings

Autor:	Dmitri Z. Garbuzov, A. G. Tsekoun, Vladimir Bulovic, S. R. Forrest, Mark E. Thompson, Paul E. Burrows
Rok vydání:	1996
Předmět:	Materials science Silicon business.industry Infrared General Physics and Astronomy chemistry.chemical_element medicine.disease_cause Fluorescence Photodiode law.invention Optical pumping chemistry law medicine Optoelectronics Thin film Luminescence business Ultraviolet
Zdroj:	Journal of Applied Physics. 80:4644-4648
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.363447
Popis:	Ultraviolet (UV) optical pumping followed by fluorescence wavelength downconversion of thin film organic light emitting materials deposited directly on the surface of Si p‐n junction diodes is found to be an accurate and rapid means to determine the film internal fluorescence efficiency. By measuring the photoresponse of the Si detectors in the UV, we find that the organic light emitting films of aluminum tris‐(8‐hydroxyquinoline) (Alq3), N,N′‐diphenyl‐N,N′‐bis‐(3‐methylphenyl)‐ 1,1′‐biphenyl‐4,4′‐diamine, and bis‐(8‐hydroxyquinaldine)‐chlorogallium (Gaq2′Cl), have internal fluorescence efficiencies of 0.30±0.05, 0.35±0.03, and 0.36±0.03, respectively. It has also been found that the organic films can be grown to a thickness which optimizes UV light conversion and can, at the same time, serve as antireflection coatings in the visible spectral region, thereby resulting in enhanced Si photodiode sensitivity extending from the UV to the infrared.
Databáze:	OpenAIRE
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