Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/16105
Título: Control of a white organic light emitting diode’s emission parameters using a single doped RGB active layer
Autor: Pereira, Daniel Alfredo de Sá
Orientador: Pereira, Luiz
Ferreira, Isabel
Palavras-chave: White OLED
Emission color tuning
Blend EML
Color stability
Large area
Data de Defesa: Set-2015
Resumo: White Color tuning is an attractive feature that Organic Light Emitting Diodes (OLEDs) offer. Up until now, there hasn’t been any report that mix both color tuning abilities with device stability. In this work, White OLEDs (W-OLEDs) based on a single RGB blend composed of a blue emitting N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) doped with a green emitting Coumarin-153 and a red emitting 4-(Dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM1) dyes were produced. The final device structure was ITO/Blend/Bathocuproine (BCP)/ Tris(8-hydroxyquinolinato)aluminium (Alq3)/Al with an emission area of 0.25 cm2. The effects of the changing in DCM1’s concentration (from 0.5% to 1% wt.) allowed a tuning in the final white color resulting in devices capable of emitting a wide range of tunes – from cool to warm – while also keeping a low device complexity and a high stabilitty. Moreover, an explanation on the optoelectrical behavior of the device is presented. The best electroluminescense (EL) points toward 160 cd/m2 of brightness and 1.1 cd/A of efficiency, both prompted to being enhanced. An Impedance Spectroscopy (IS) analysis allowed to study both the effects of BCP as a Hole Blocking Layer and as an aging probe of the device. Finally, as a proof of concept, the emission was increased 9 and 64 times proving this structure can be effectively applied for general lighting.
URI: http://hdl.handle.net/10362/16105
Designação: Mestrado em Engenharia de Micro e Nanotecnologias
Aparece nas colecções:FCT: DCM - Dissertações de Mestrado

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