Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating

H.A. Méndez-Pinzón; D.R. Pardo-Pardo; J.P. Cuéllar-Alvarado; J.C. Salcedo-Reyes; R. Vera; B.A. Páez-Sierra

doi:10.11144/javeriana.sc15-1.aotc

Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating

Título traducido de la contribución: Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating

H.A. Méndez-Pinzón, D.R. Pardo-Pardo, J.P. Cuéllar-Alvarado, J.C. Salcedo-Reyes, R. Vera, B.A. Páez-Sierra

Producción: Contribución a una revista › Artículo › revisión exhaustiva

21 Citas (Scopus)

Resumen

Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositadospor spin coating. Se fabricaron diodos orgánicos emisores de luz (OLEDs) con la estructura ITO / PEDOT:PSS / MDMO-PPV / Metalmediante la técnica de spin coating. Es ampliamente conocido que la electroluminiscencia de estos diodos depende fuertemente delmaterial usado como cátodo y también de los parámetros de crecimiento de la capa del polímero electroluminiscente MDMO-PPV.Objetivo. En este trabajo el efecto de i) la frecuencia del spin coater (1000-8000 rpm), ii) la concentración de la solución MDMO-PPV:Tolueno y iii) el material usado como cátodo (plata o aluminio) sobre la repuesta eléctrica de los dispositivos, fue evaluado a través demedidas de corriente-voltaje (I-V). Materiales y métodos. Películas delgadas de los materiales orgánicos PEDOT:PSS y MDMO-PPVfueron depositados por spin coating sobre sustratos de ITO, y la estructura del OLED fue terminada con cátodo de plata y aluminio. Larespuesta eléctrica de los dispositivos fue evaluada a través de su característica I-V. Resultados. Los diodos fabricados con películasorgánicas más delgadas son los que suministran mayores corrientes a menores voltajes. Esto puede lograrse ya sea incrementando lafrecuencia de rotación del spin coating o usando concentraciones de MDMO-PPV: Tolueno menores al 2% en peso. Un ajuste de los datos experimentales demostró que los diodos poseen contribuciones de una corriente parásita entre ánodo y cátodo, y otra corrienteparalela en donde el mecanismo predominante de inyección de portadores a la capa orgánica es a través de emisión termoiónica.Conclusiones. El ajuste de los datos experimentales, junto con la posición de niveles de energía a través de la heteroestructura,demuestra que los OLEDs basados en derivados de PPV son dispositivos unipolares, en el que la corriente se atribuye principalmentea transporte de huecos.

Título traducido de la contribución	Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating
Idioma original	Inglés
Páginas (desde-hasta)	1-9
Número de páginas	9
Publicación	Universitas Scientiarum
Volumen	15
N.º	1
DOI	https://doi.org/10.11144/javeriana.sc15-1.aotc
Estado	Publicada - 2010

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@article{3e850da0941742c38ff9f0610a17a29a,

title = "Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating",

abstract = "Polymer-based organic light-emitting diodes (OLEDs) with the structure ITO / PEDOT:PSS / MDMO-PPV / Metal were prepared by spincoating. It is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the depositionparameters of the polymer electroluminescent layer MDMO-PPV. Objective. In this work the effect of i) the frequency of the spin coater(1000-8000 rpm), ii) the concentration of the MDMO-PPV: Toluene solution, and iii) the material used as cathode (Aluminium or Silver)on the electrical response of the devices, was evaluated through current-voltage (I-V) measurements. Materials and methods. PEDOT:PPSand MDMO-PPV organic layers were deposited by spin coating on ITO substrates, and the OLED structure was completed with cathodesof aluminium and silver. The electric response of the devices was evaluated based on the I-V characteristics. Results. Diodes prepared withthinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater orby using concentrations of MDMO-PPV: Toluene lower than 2\% weight. A fit of the experimental data showed that the diodes have twocontributions to the current. The first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel currentthrough the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. Conclusions. The results of thefitting and the energy level alignment through the whole structure show that PPV-based OLEDs are unipolar devices, with current mainlyattributed to hole transport.",

author = "H.A. M{\'e}ndez-Pinz{\'o}n and D.R. Pardo-Pardo and J.P. Cu{\'e}llar-Alvarado and J.C. Salcedo-Reyes and R. Vera and B.A. P{\'a}ez-Sierra",

year = "2010",

doi = "10.11144/javeriana.sc15-1.aotc",

language = "English",

volume = "15",

pages = "1--9",

journal = "Universitas Scientiarum",

issn = "0122-7483",

publisher = "Pontificia Universidad Javeriana",

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T1 - Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating

AU - Méndez-Pinzón, H.A.

AU - Pardo-Pardo, D.R.

AU - Cuéllar-Alvarado, J.P.

AU - Salcedo-Reyes, J.C.

AU - Vera, R.

AU - Páez-Sierra, B.A.

PY - 2010

Y1 - 2010

N2 - Polymer-based organic light-emitting diodes (OLEDs) with the structure ITO / PEDOT:PSS / MDMO-PPV / Metal were prepared by spincoating. It is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the depositionparameters of the polymer electroluminescent layer MDMO-PPV. Objective. In this work the effect of i) the frequency of the spin coater(1000-8000 rpm), ii) the concentration of the MDMO-PPV: Toluene solution, and iii) the material used as cathode (Aluminium or Silver)on the electrical response of the devices, was evaluated through current-voltage (I-V) measurements. Materials and methods. PEDOT:PPSand MDMO-PPV organic layers were deposited by spin coating on ITO substrates, and the OLED structure was completed with cathodesof aluminium and silver. The electric response of the devices was evaluated based on the I-V characteristics. Results. Diodes prepared withthinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater orby using concentrations of MDMO-PPV: Toluene lower than 2% weight. A fit of the experimental data showed that the diodes have twocontributions to the current. The first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel currentthrough the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. Conclusions. The results of thefitting and the energy level alignment through the whole structure show that PPV-based OLEDs are unipolar devices, with current mainlyattributed to hole transport.

AB - Polymer-based organic light-emitting diodes (OLEDs) with the structure ITO / PEDOT:PSS / MDMO-PPV / Metal were prepared by spincoating. It is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the depositionparameters of the polymer electroluminescent layer MDMO-PPV. Objective. In this work the effect of i) the frequency of the spin coater(1000-8000 rpm), ii) the concentration of the MDMO-PPV: Toluene solution, and iii) the material used as cathode (Aluminium or Silver)on the electrical response of the devices, was evaluated through current-voltage (I-V) measurements. Materials and methods. PEDOT:PPSand MDMO-PPV organic layers were deposited by spin coating on ITO substrates, and the OLED structure was completed with cathodesof aluminium and silver. The electric response of the devices was evaluated based on the I-V characteristics. Results. Diodes prepared withthinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater orby using concentrations of MDMO-PPV: Toluene lower than 2% weight. A fit of the experimental data showed that the diodes have twocontributions to the current. The first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel currentthrough the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. Conclusions. The results of thefitting and the energy level alignment through the whole structure show that PPV-based OLEDs are unipolar devices, with current mainlyattributed to hole transport.

UR - https://www.scopus.com/pages/publications/77955974565

U2 - 10.11144/javeriana.sc15-1.aotc

DO - 10.11144/javeriana.sc15-1.aotc

M3 - Article

SN - 0122-7483

VL - 15

SP - 1

EP - 9

JO - Universitas Scientiarum

JF - Universitas Scientiarum

IS - 1

ER -

Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating

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