Optical probes of electronics states injected into poly(p-phenylenevinylene) electroluminescent devices

A. R. Brown; K. Pichler; N. C. Greenham; D. D.C. Bradley; R. H. Friend; P. L. Burn; A. B. Holmes

doi:10.1016/0379-6779(93)90567-G

Optical probes of electronics states injected into poly(p-phenylenevinylene) electroluminescent devices

A. R. Brown, K. Pichler, N. C. Greenham, D. D.C. Bradley, R. H. Friend, P. L. Burn, A. B. Holmes

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

12 Scopus citations

Abstract

We have been working to characterise the electronic excitations created by charge injection into conjugated polymers such as poly(p-phenylenevinylene) in electroluminescent devices. We report on the optical probing of electronic states injected into an indium-tin oxide/PPV/calcium electroluminescent device. We monitor changes in absorption in the polymer film due to charge carrier injection into the device by detecting the reflection of a probe beam off the back metal contact layer. These injected carriers are expected to reside in states with energy levels within the band gap and hence give rise to a change in the sub-band gap optical properties. We observe absorption features centred around 1.38 eV, 1.55 eV, 0.65 eV. These states closely resemble those seen in photoinduced absorption and have been assigned to optical transitions involving bipolarons (0.65 and 1.55 eV) and a triplet-exciton (1.38 eV). © 1993.

Original language	English (US)
Journal	Synthetic Metals
Volume	57
Issue number	1
DOIs	https://doi.org/10.1016/0379-6779(93)90567-G
State	Published - Apr 12 1993
Externally published	Yes

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@article{119b549fd4cf48fb8b8de623faca71fa,

title = "Optical probes of electronics states injected into poly(p-phenylenevinylene) electroluminescent devices",

abstract = "We have been working to characterise the electronic excitations created by charge injection into conjugated polymers such as poly(p-phenylenevinylene) in electroluminescent devices. We report on the optical probing of electronic states injected into an indium-tin oxide/PPV/calcium electroluminescent device. We monitor changes in absorption in the polymer film due to charge carrier injection into the device by detecting the reflection of a probe beam off the back metal contact layer. These injected carriers are expected to reside in states with energy levels within the band gap and hence give rise to a change in the sub-band gap optical properties. We observe absorption features centred around 1.38 eV, 1.55 eV, 0.65 eV. These states closely resemble those seen in photoinduced absorption and have been assigned to optical transitions involving bipolarons (0.65 and 1.55 eV) and a triplet-exciton (1.38 eV). {\textcopyright} 1993.",

author = "Brown, {A. R.} and K. Pichler and Greenham, {N. C.} and Bradley, {D. D.C.} and Friend, {R. H.} and Burn, {P. L.} and Holmes, {A. B.}",

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year = "1993",

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day = "12",

doi = "10.1016/0379-6779(93)90567-G",

language = "English (US)",

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T1 - Optical probes of electronics states injected into poly(p-phenylenevinylene) electroluminescent devices

AU - Brown, A. R.

AU - Pichler, K.

AU - Greenham, N. C.

AU - Bradley, D. D.C.

AU - Friend, R. H.

AU - Burn, P. L.

AU - Holmes, A. B.

N1 - Generated from Scopus record by KAUST IRTS on 2019-11-27

PY - 1993/4/12

Y1 - 1993/4/12

N2 - We have been working to characterise the electronic excitations created by charge injection into conjugated polymers such as poly(p-phenylenevinylene) in electroluminescent devices. We report on the optical probing of electronic states injected into an indium-tin oxide/PPV/calcium electroluminescent device. We monitor changes in absorption in the polymer film due to charge carrier injection into the device by detecting the reflection of a probe beam off the back metal contact layer. These injected carriers are expected to reside in states with energy levels within the band gap and hence give rise to a change in the sub-band gap optical properties. We observe absorption features centred around 1.38 eV, 1.55 eV, 0.65 eV. These states closely resemble those seen in photoinduced absorption and have been assigned to optical transitions involving bipolarons (0.65 and 1.55 eV) and a triplet-exciton (1.38 eV). © 1993.

AB - We have been working to characterise the electronic excitations created by charge injection into conjugated polymers such as poly(p-phenylenevinylene) in electroluminescent devices. We report on the optical probing of electronic states injected into an indium-tin oxide/PPV/calcium electroluminescent device. We monitor changes in absorption in the polymer film due to charge carrier injection into the device by detecting the reflection of a probe beam off the back metal contact layer. These injected carriers are expected to reside in states with energy levels within the band gap and hence give rise to a change in the sub-band gap optical properties. We observe absorption features centred around 1.38 eV, 1.55 eV, 0.65 eV. These states closely resemble those seen in photoinduced absorption and have been assigned to optical transitions involving bipolarons (0.65 and 1.55 eV) and a triplet-exciton (1.38 eV). © 1993.

UR - https://linkinghub.elsevier.com/retrieve/pii/037967799390567G

UR - http://www.scopus.com/inward/record.url?scp=0027574408&partnerID=8YFLogxK

U2 - 10.1016/0379-6779(93)90567-G

DO - 10.1016/0379-6779(93)90567-G

M3 - Article

SN - 0379-6779

VL - 57

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1

ER -

Optical probes of electronics states injected into poly(p-phenylenevinylene) electroluminescent devices

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