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Enhanced life time and suppressed efficiency roll-off in phosphorescent organic light-emitting diodes with multiple quantum well structures
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Figures

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FIG. 1.

(a) Energy band diagram of fabricated red PHOLEDs with MQW structures. The red dotted lines in EML means both LUMO (3.0 eV) and HOMO (5.2 eV) levels of Ir(pq)2(acac) dopant. QW as n=1 in EML consist of LPGH 154:10% Ir(pq)2(acac)/LPGH 154 and increasing of QWs leads repetitive increasing of LPGH 154:10% Ir(pq)2(acac)/LPGH 154 unit, and (b) Chemical structure of LPGH 154 used in this study.

Image of FIG. 2.

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FIG. 2.

Current density–voltage–luminance (J–V–L) characteristics of fabricated red PHOLEDs.

Image of FIG. 3.

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FIG. 3.

EQE characteristics of fabricated red PHOLEDs; (inset) luminous efficiency–luminance characteristics.

Image of FIG. 4.

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FIG. 4.

(a) Lifetime characteristics of fabricated red PHOLEDs at a luminance of 500 cd/m2, and (b) EQE roll-off and lifetime at 97% of 500 cd/m2 versus number of quantum well characteristics.

Tables

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Table I.

Summary of MQW red PHOLED performances.

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/content/aip/journal/adva/2/1/10.1063/1.3679428
2012-01-12
2014-04-21

Abstract

We demonstrate red phosphorescent organic light-emitting diodes(OLEDs) with multiple quantum well structures which confine triplet exciton inside an emitting layer (EML) region. Five types of OLEDs, from a single to five quantum wells, are fabricated with charge control layers to produce high efficiencies, and the performance of the devices is investigated. The improved quantum efficiency and lifetime of the OLED with four quantum wells, and its suppressed quantum efficiency roll-off of 17.6%, can be described by the increased electron–hole charge balance owing to the bipolar property as well as the efficient triplet exciton confinement within each EML, and by prevention of serious triplet–triplet and/or triplet–polaron annihilation as well as the Förster self-quenching due to charge control layers.

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Scitation: Enhanced life time and suppressed efficiency roll-off in phosphorescent organic light-emitting diodes with multiple quantum well structures
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/1/10.1063/1.3679428
10.1063/1.3679428
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