Emission properties of dopants rubrene and coumarin 6 in Alq3 films

Uddin, Ashraf; Lee, C.B.; Wong, Javier

doi:10.1016/j.jlumin.2011.01.018

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…The rubrene thin films exhibit yellow green fluorescence that has a main peak near 2.21 eV (561 nm) and a subpeak near 2.07 eV (599 nm). The main peak at 2.21 eV corresponds to the gap energy between the highest occupied molecular orbital and lowest unoccupied molecular orbital for rubrene thin films; that is, E g 2.2 eV [11,12]. Figure 3 depicts PL spectra of a rubrene thin film (500 nm thick) on Ag (50 nm) measured at different emission angles.…”

Section: Resultsmentioning

confidence: 99%

“…Another characteristic of rubrene molecules is their visible fluorescence. The high electrical conduction and efficient fluorescence of rubrene thin films are beneficial for electrical and optical applications such as organic light-emitting diodes (OLEDs) [10][11][12]. In organic devices, rubrene layers are frequently configured on a metal electrode, so the behavior of rubrene layers on metal is extremely important.…”

Section: Introductionmentioning

confidence: 99%

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Emission-angle-dependent photoluminescence of rubrene thin films on silver

Wakamatsu

2014

Appl. Opt.

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Rubrene layers with thickness comparable to a visible light wavelength on silver thin film exhibit anomalous photoluminescence (PL) spectra that depend strongly on emission angle. The PL properties demonstrated for rubrene (500 nm)/Ag (50 nm) were modulated from yellow green to red luminescence with an increasing emission angle. The factors influencing the emission-angle-dependent PL spectra are discussed from two viewpoints: spectral modulation of rubrene PL by loss of fluorescence photon energy and additional luminescence resulting from optical interference in the rubrene layer or optical modes excited by rubrene molecules.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emission-angle-dependent photoluminescence of rubrene thin films on silver

Wakamatsu

2014

Appl. Opt.

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“…11,12 C6 has generated substantial attention in optoelectronic applications after its successful introduction as an effective dopant in organic light-emitting diodes (OLEDs). 13,14 Such as OLEDs with low turn-on voltages were fabricated in polyvinylcarbazol (PVK) doped with C6 deposited using ink-jet printing 15 and spin coating. 16 Also, Ismail et al used C6 dye was used as a donor material in bulk heterojunctions (BHJ), 17 and they studied the effect of tbe dye on light harvesting and photocurrent of the P3HT:PCBM solar cell.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 14. The variation of (a) σ1 and (b) σ2 for as-deposited and annealed thin films as a function of hν.…”

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confidence: 99%

Structural and Optical Properties of Nanocrystalline 3-(2-Benzothiazolyl)-7-(diethylamino) Coumarin (C6) Thin Films for Optoelectronic Application

Ebied

Dongol

Elhaes

et al. 2022

J. Electron. Mater.

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In the current work, the structural and optical properties of thermally evaporated 3-(2-Benzothiazolyl)-7-(diethylamino) coumarin [Coumarin 6 (C6)] thin films on a pre-cleaned quartz substrate were studied as a function of the annealing temperature. The influence of annealing on the structural, morphological, and molecular structures was investigated by x-ray diffraction (XRD), atomic force microscopy (AFM), and Fourier transform infrared (FTIR) spectroscopy, respectively. The XRD and AFM results confirmed that the as-deposited and annealed films have nanostructural features (30.96–45.34 nm). Also, the increase in roughness of the C6 thin film surface resulted from particle agglomeration and coalescence. Optical constants of C6 thin films were derived from the transmittance T(λ) and reflectance, R(λ) measurements in the spectral range of 200–2500 nm. Analysis of the optical absorption coefficient data indicates that the type of electronic transition in these films is an indirect allowed transition. The estimated optical band gap was decreased from 2.12 eV to 2.01 eV as the annealing temperature was increased. Dispersion and dielectric parameters were determined as functions of the annealing temperature. Lastly, nonlinear optical parameters such as the third-order nonlinear susceptibility, χ(3) and nonlinear refractive index, n(2) were estimated and influenced by annealing temperature. The optical properties of C6 thin films were showed that C6 thin films would be used in a wide range of photonic applications Graphical Abstract

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“…This bilayer-structure WOLED shows quite simple configuration of ITO/ hole-injection layer/ hole-transport-and-blue-emitting layer (HT-BEML)/electron-transportand-yellow-green-emitting layer (ET-YEML)/electron-injection layer/ cathode. 5,6,11,12-tetraphenylnaphthacene (rubrene) doped tris(8-hydroxy-quinolinato)aluminum (Alq 3 ), [Alq 3 :rubrene], is one of the most widely-used yellow-green emitter for its excellent emitting efficiency and film morphology [9][10][11][12]. Consequently, the electron transporting characteristics play a crucial role in bilayer-structure WOLED with [Alq 3 :rubrene] as ET-YEML.…”

Section: Introductionmentioning

confidence: 99%

Bilayer-structure white organic light-emitting diode based on [Alq3:rubrene] and the electron transporting characteristics investigation using impedance spectroscopy

Zhang

et al. 2015

Optics & Laser Technology

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Emission properties of dopants rubrene and coumarin 6 in Alq3 films

Cited by 14 publications

References 16 publications

Emission-angle-dependent photoluminescence of rubrene thin films on silver

Emission-angle-dependent photoluminescence of rubrene thin films on silver

Structural and Optical Properties of Nanocrystalline 3-(2-Benzothiazolyl)-7-(diethylamino) Coumarin (C6) Thin Films for Optoelectronic Application

Bilayer-structure white organic light-emitting diode based on [Alq3:rubrene] and the electron transporting characteristics investigation using impedance spectroscopy

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