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Initial rise of transient electroluminescence in doped Alq(3) films

A. Uddin ; C. B. Lee ; Thorvald Andersson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
Physica Status Solidi A - Applications and Materials Science (1862-6300). Vol. 207 (2010), 10, p. 2334-2338.
[Artikel, refereegranskad vetenskaplig]

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 (Alq(3)) film with various concentrations from 0.5 to 24wt%. 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 mu s in doped OLED compared to 0.74 mu s in pure Alq(3) device. The EL saturation time was found from 1.2 to 2.8 mu s 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 x 10(-5) cm(2) V-1 s(-1) in doped Alq(3) films.

Nyckelord: doping, electroluminescence, light-emitting diodes, organic semiconductors



Denna post skapades 2011-01-21. Senast ändrad 2012-02-17.
CPL Pubid: 135785

 

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