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Highly efficient orange-red phosphorescent organic light-emitting diode using 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene as the host
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Figures

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FIG. 1.

Current efficiency results at of the studied OLEDs and previously reported ones on the (a) CIE diagram and (b) current density.

Image of FIG. 2.

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FIG. 2.

The energy diagram of (a) the studied devices using Spiro-2CBP, Spiro-CBP, and CBP as host, and the molecular structure of the host materials and (b) the Spiro-2CBP-composing devices incorporated Spiro-2CBP or TAPC as the ECL. Also shown are plausible distributions of holes and electrons in the studied devices.

Image of FIG. 3.

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FIG. 3.

(a) Current density and (b) luminance results of the Spiro-2CBP-composing orange-red device, comparing with those of the Spiro-CBP- and CBP-composing counterparts. To improve the efficiency of Spiro-2CBP-composing device, an ECL, Spiro-2CBP, or TAPC, is inserted between the layers of PEDOT: PSS and emissive layer. ( and refer to the devices using Spiro-2CBP and TAPC as the ECL, respectively.)

Tables

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Table I.

Electroluminescent characteristics of the Spiro-2CBP-composing devices, comparing with those of the Spiro-CBP- and CBP-composing counterparts.

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/content/aip/journal/apl/96/14/10.1063/1.3374326
2010-04-08
2014-04-20

Abstract

We demonstrate an efficient orange-red organic light-emitting diode using a host, 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene, doped with tris(2-phenylquinoline) iridium(III). The device exhibits a high current efficiency of 44.8 cd/A at . This may be attributed to the adoption of the host, which favors the injection of holes, as well as the emissive-layer architecture enabling excitons to form on host and hence favoring efficient energy-transfer from host to guest. Moreover, an electron-confining layer is used to modulate excessive holes to be injected into emissive layer and confine the electrons, which would in turn balance the injection of both carriers and improve efficiency.

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Scitation: Highly efficient orange-red phosphorescent organic light-emitting diode using 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene as the host
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/14/10.1063/1.3374326
10.1063/1.3374326
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