Improvement of environmental stability of aluminum tris(8-hydroxyquinoline) thin films

Baldacchini, G.; Baldacchini, Tommaso; Gagliardi, Serena; Montereali, Rosa Maria; Pace, A.; Pode, Ramchandra

doi:10.1016/s0040-6090(02)00597-7

Cited by 17 publications

(14 citation statements)

References 6 publications

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“…The maximum emission intensity of 1400 (arbitrary units) is observed at a wavelength of $512 nm for the excitation wavelength of $381 nm as shown in Figure 3. The excitation and emission wavelengths observed in 3D contour emission spectrum for the as-prepared Alq 3 sample are consistent with earlier reports [14,17] . For Alq 3 sample exposed to light, only one contour is observed as in the case of as-prepared sample.…”

Section: D Contour Emission Studiessupporting

confidence: 92%

“…However, OLEDs based on Alq 3 thin film show relatively poor stability, which remains a challenging issue for the commercial applications [10][11][12] . Alq 3 is very sensitive to environmental aging [13][14][15] and photo-oxidation [16] . Aziz et al [11] reported that the fluorescence efficiency of Alq 3 thin film in the device is decreasing during the operation and explained that the cationic Alq 3 species are unstable and their degradation product acts as luminescent quencher.…”

Section: Introductionmentioning

confidence: 99%

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Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Thangaraju

Amaladass

Mohanakrishnan

et al. 2010

Polymer-Plastics Technology and Engineering

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Organic Tris-(8-hydroxyquinoline)aluminum (Alq 3 ) thin films, one of the most widely used electron transport as well as emissive materials in the organic electroluminescent (EL) devices, have been deposited on glass substrates by thermal evaporation process. The deposited Alq 3 thin films were exposed to light in the normal ambient. The effect of light exposure on the fluorescence of Alq 3 sample and formation of luminescent quencher has been studied using cyclic voltammeter and 3D contour emission spectroscopy. It is observed that the luminescent quencher can be formed in the Alq 3 during the light exposure, quenching the emission of light exposed sample. It is found that the energy of excitons in the Alq 3 molecule in the light exposed Alq 3 thin films can be non-radiatively transferred to its neighbouring luminescent quencher, quenching the emission of light exposed Alq 3 thin films.

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Section: D Contour Emission Studiessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Thangaraju

Amaladass

Mohanakrishnan

et al. 2010

Polymer-Plastics Technology and Engineering

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“…The characteristic absorption peak of an as-prepared Alq 3 thin film is observed at a wavelength of 380 nm, which is consistent with earlier reports [7,11]. It is also observed that the absorption peak intensities of irradiated Alq 3 thin films decrease with increasing the ion fluences.…”

Section: Uv-visible and Ir Spectroscopysupporting

confidence: 91%

Swift heavy ion irradiation-induced modifications of tris-(8-hydroxyquinoline)aluminum thin films

Thangaraju

Rajendran

Mohanty

et al. 2006

Radiation Effects and Defects in Solids

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Tris-(8-hydroxyquinoline)aluminum (Alq 3 ), one of the most widely used light emitting and electron transport materials in organic luminescent devices, has been synthesized. Alq 3 thin films have been deposited by a thermal evaporation process on glass substrates. The effect of swift heavy ion (SHI) irradiation using 40 MeV Li 3+ on the Alq 3 thin films has been studied by UV-visible, infrared, photoluminescence (PL) and time-resolved photoluminescence (TRPL) spectroscopy. From TRPL studies, it is found that the PL of Alq 3 thin films arises from two species corresponding to its two geometrical isomers, namely facial and meridional having two different life times. It is also confirmed that the PL and lifetimes of excitons decrease with the increase of ion fluences of SHI of 40 MeV Li 3+ , indicating a transfer of exciton energy to unstable cationic Alq 3 species generated by SHI irradiation.

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“…While much progress has been made in enhancing OLED efficiency, the stability and lifetime of OLEDs still need to be considerably improved. In particular, Alq 3 is very sensitive to oxygen and moisture (36)(37)(38)(39)(40). Conventionally, the best emitting materials for use in organic EL devices is Alq 3 complex.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of Alq₃‐ and Tb‐activated aluminium–tris(8‐hydroxyquinoline) complex for blue chip‐excited OLEDs

Yawalkar¹,

Dhoble

Kalyani³

et al. 2012

Luminescence

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The tris(8-hydroxyquinoline)-aluminium complex is the most important and widely studied as electron transporting and green light emitting material. Alq(3) and Tb(x) Al((1-x)) q(3) have been synthesized (where x = 0.1, 0.3, 0.5, 0.7 and 0.9) and blended films of Alq(3) and Tb(x) Al((1-x)) q(3) with PMMA and PS at different percentage weight (wt%) concentrations (e.g., 0.1, 1, 5, 10, 25 and 50 wt%) have been prepared. The synthesized materials and their blended thin films have been characterized by a photoluminescence (PL) technique; the synthesis and PL characterization are reported in this paper. The synthesized metal complex shows bright emission of green light with blue light excitation (440 nm) and the prepared Tb(x) Al((1-x)) q(3) phosphor may be applicable in blue chip-excited OLEDs for the newly developed wallpaper lighting technology.

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Improvement of environmental stability of aluminum tris(8-hydroxyquinoline) thin films

Cited by 17 publications

References 6 publications

Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Swift heavy ion irradiation-induced modifications of tris-(8-hydroxyquinoline)aluminum thin films

Photoluminescence of Alq₃‐ and Tb‐activated aluminium–tris(8‐hydroxyquinoline) complex for blue chip‐excited OLEDs

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Improvement of environmental stability of aluminum tris(8-hydroxyquinoline) thin films

Cited by 17 publications

References 6 publications

Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Studies on the Fluorescence of Tris-(8-hydroxyquinoline)Aluminum and the Effect of Light Exposure

Swift heavy ion irradiation-induced modifications of tris-(8-hydroxyquinoline)aluminum thin films

Photoluminescence of Alq3‐ and Tb‐activated aluminium–tris(8‐hydroxyquinoline) complex for blue chip‐excited OLEDs

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Product

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Photoluminescence of Alq₃‐ and Tb‐activated aluminium–tris(8‐hydroxyquinoline) complex for blue chip‐excited OLEDs