Rahong, Sakon
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Rahong, Sakon
Alternative Name
Rahong, S.
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Email
sakon.ra@kmitl.ac.th
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Item type:Publication, Growth and characterization of novel optoelectronic materials. Based on II-VI inorganic/organic heterostructures(2006-01-01); ; ; Novel optoelectronic materials based on II-VI inorganic/organic low-dimensional heterostructure were successfully grown by electron beam evaporator. The structures were based on ZnSe, tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>) and N,N'-bis(3-methylphenyl)-N,N'-diphenyl-benzidine (TPD). The surface morphology of the structures was investigated by atomic force microscopy and field emission scanning electron microscope. The optical and electronic properties were examined by photoluminescence, photocurrent and electroreflectance spectroscopy. Photoluminescence spectra of the ZnSe/Alq <inf>3</inf>/ZnSe structure attributed to the change of exciton energy as a result of quantum confinement showed the formation of single quantum well structure. The luminescence color can be varied by changing the thickness of the Alq<inf>3</inf> layer. The other heterostructure of ZnSe/Alq<inf>3</inf>/TPD was grown on silicon substrate. The wavelength response of this structure shown by photocurrent signal ranged from 450 nm to 1100 nm. Electroreflectance features due to optical transition energy of the single quantum well of this structure were also observed. Under applied voltage, electroreflectance signals showed significant shift due to the quantum confined Stark effect. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electroreflectance and photocurrent measurement of ZnSe/Alq 3/TPD heterostructure on Si-substrate(2005-11-20); ; ; The optical transition energy in ZnSe/tris(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>)/N,N′-bis(3-methylphenyl)-N,N′-diphenyl-benzidine (TPD) heterostructure were investigated by room-temperature electroreflectance (ER) and photocurrent (PC) measurements. PC signal showed wavelength response of the device in the range of 450-1100 nm. ER features due to optical transition energy of the single quantum well of this structure were observed. The transition energies were determined by fitting the ER spectra to the theoretical line-shape expression. The subband transition energy decreased with increasing well thickness. Under applied voltage, both ER signals show significant shift due to the quantum confined Stark effect. © 2005 Elsevier B.V. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modulation spectroscopy study of inorganic-organic hybrid quantum well-like nanostructures(2007-08-28); The optical transition energy in zinc selenide (ZnSe)/tris(8- hydroxyquinoline) aluminum (Alq3) /N,N'-Bis(3-methyphenyl)-N,N -diphenylbenzidine inorganic-organic hybrid quantum well-like nanostructures (hybrid QW-like nanostructure) with well thickness of Aq3 from 10 to 50 nm were investigated by modulation spectroscopy as electroreflectance (ER) measurements. ER features due to optical transition energy were observed in the hybrid QW of well thickness. The transition energies were determined by fitting the ER spectra to the theoretical line-shape expression. The subband transition energy decreased with increasing well thickness might be due to the increase of well results in the reduction of quantum confinement energy. © 2007 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Observation of optical transition energy in ZnSe/tris(8-hydroxyquinoline) aluminum (Alq3)/ZnSe single quantum wells by photoreflectance spectroscopy(2004-03-01); ; ; The optical transition energy in ZnSe/tris(8-hydroxyquinoline) aluminum (Alq3)/ZnSe single quantum wells (SQW) thin films with well thickness from 5 to 50 nm was investigated by room-temperature photoreflectance (PR) measurements. PR features due to optical transition energy were observed in the SQWs of well thicknesses. The transition energies were determined by fitting the PR spectra to the theoretical line-shape expression. The transition energy decreased with increasing well thickness. © 2003 Elsevier B.V. All rights reserved.