An inconvenient influence of iridium(III) isomer on OLED efficiency

Etienne Baranoff; Henk J. Bolink; Filippo De Angelis; Simona Fantacci; Davide Di Censo; Karim Djellab; Michael Grätzel; Md Khaja Nazeeruddin; Etienne Baranoff

doi:10.1039/c0dt00414f

An inconvenient influence of iridium(III) isomer on OLED efficiency

Etienne Baranoff^*, Henk J. Bolink, Filippo De Angelis, Simona Fantacci, Davide Di Censo, Karim Djellab, Michael Grätzel, Md Khaja Nazeeruddin, Etienne Baranoff

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)₂(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.

Original language	English
Pages (from-to)	8914-8918
Number of pages	5
Journal	Dalton Transactions
Volume	39
Issue number	38
DOIs	https://doi.org/10.1039/c0dt00414f
Publication status	Published - 14 Oct 2010

ASJC Scopus subject areas

Inorganic Chemistry

Access to Document

10.1039/c0dt00414f

Cite this

@article{cb916738565744bba19257243aeea04e,

title = "An inconvenient influence of iridium(III) isomer on OLED efficiency",

abstract = "The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)2(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.",

author = "Etienne Baranoff and Bolink, {Henk J.} and {De Angelis}, Filippo and Simona Fantacci and {Di Censo}, Davide and Karim Djellab and Michael Gr{\"a}tzel and Nazeeruddin, {Md Khaja} and Etienne Baranoff",

year = "2010",

month = oct,

day = "14",

doi = "10.1039/c0dt00414f",

language = "English",

volume = "39",

pages = "8914--8918",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry",

number = "38",

}

TY - JOUR

T1 - An inconvenient influence of iridium(III) isomer on OLED efficiency

AU - Baranoff, Etienne

AU - Bolink, Henk J.

AU - De Angelis, Filippo

AU - Fantacci, Simona

AU - Di Censo, Davide

AU - Djellab, Karim

AU - Grätzel, Michael

AU - Nazeeruddin, Md Khaja

AU - Baranoff, Etienne

PY - 2010/10/14

Y1 - 2010/10/14

N2 - The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)2(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.

AB - The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)2(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.

UR - http://www.scopus.com/inward/record.url?scp=77956920074&partnerID=8YFLogxK

U2 - 10.1039/c0dt00414f

DO - 10.1039/c0dt00414f

M3 - Article

C2 - 20714627

AN - SCOPUS:77956920074

SN - 1477-9226

VL - 39

SP - 8914

EP - 8918

JO - Dalton Transactions

JF - Dalton Transactions

IS - 38

ER -

An inconvenient influence of iridium(III) isomer on OLED efficiency

Abstract

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this