Effect of polar dopant on energetic and positional disorders in tris(8-hydroxyquinolinato) aluminum (Alq3)

Lee, C.B.; Uddin, Ashraf; Teo, Chin Chye

doi:10.1007/s00339-005-3467-y

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Especially Alq 3 :Rb film showed a low onset time. The stronger polar nature of the DCM molecule compared to other two dopants may be responsible for the higher t d in the Alq 3 :DCM films 18. Also the EL (switch‐on) time, t r , increased with doping concentration for all dopants, as shown in Fig.…”

Section: Resultsmentioning

confidence: 78%

“…5(b). The details of the TOF measurements have been described before 18. The estimated carrier mobility from the transient EL measurements is lower than the values obtained through the TOF method but the trend with doping concentration is same in both measurements.…”

Section: Resultsmentioning

confidence: 96%

“…The non‐polar Rb induces the disorder of density‐of‐state due to van der Waals component σ vdW with Alq 3 molecules, but this van der Waals effect is weak compared to σ dipolar 21. The polarity of the DCM molecules in the Alq 3 films induced deep localized states 14 and these traps strongly affect the charge mobility at equilibrium conditions 18.…”

Section: Resultsmentioning

confidence: 99%

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Initial rise of transient electroluminescence in doped Alq₃ films

Uddin

Lee

Andersson

2010

Physica Status Solidi (a)

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The doping effect on initial rise of transient electroluminescence (EL) in organic light emitting diodes (OLEDs) is investigated. The dopants red light emitter 5,6,11,12‐tetraphenylnaphthacene (Rb) and 4‐(diacynomethylene)‐2‐methyl‐6‐(p‐dimethylaminostyryl)‐4H‐pyan (DCM), and yellow light emitter 3‐(2′‐benzothiazolyl)‐7‐diethylaminocoumarin (C‐6) were used in green light emitter tris‐(8‐hydroxyquinoline) aluminum (Alq3) film with various concentrations from 0.5 to 24 wt%. The increase of EL delay time and the slower rise of EL saturation were observed with doping concentrations. The values of EL delay time was found from 0.78 to 1.86 µs in doped OLED compared to 0.74 µs in pure Alq3 device. The EL saturation time was found from 1.2 to 2.8 µs for different doping concentration. We have also estimated the carrier mobility from the transient EL measurements. The charge‐carrier mobility was found as 0.5–1.2 × 10−5 cm2 V−1 s−1 in doped Alq3 films.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Initial rise of transient electroluminescence in doped Alq₃ films

Uddin

Lee

Andersson

2010

Physica Status Solidi (a)

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“…Tris-(8-hydroxyquinolinato)-aluminum (Alq 3 ) is one of the chelate metal complexes and has been intensity used in thin films as light emitters in organic light emitting diode (OLED) [5,6]. The organic dye, 4-(diacynomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyan (DCM) is one of the most commonly used red emitters in color OLED.…”

Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopy Studies of DCM Doped Alq<sub>3</sub> Organic Material

Keeratithiwakorn

Onlaor

Thiwawong

et al. 2013

AMR

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In this work, we report on the frequency-impedance characteristics of dye-doped organic material. The device structure is glass substrate/indium tin oxide/DCM:Alq3/Aluminum 100 nm. The influence of doping concentraion has been investigated by impedance spectroscopy. The impedance characteristics of the dye-doped organic material can be modelled by simply adopting the conventional equivalent circuit with the simple combination of resistors and capacitor network. The variation of bulk resistance with applied bias voltage as a result of the Space Charge Limited Conduction (SCLC) mechanism for charge conduction.

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