Charge trap assisted high efficiency in new polymer-blend based light emitting diodes

M. U. Hassan; Yee Chen Liu; Kamran Ul Hasan; H. Butt; Jui Fen Chang; R. H. Friend

doi:10.1016/j.nanoen.2015.12.023

Charge trap assisted high efficiency in new polymer-blend based light emitting diodes

M. U. Hassan^*, Yee Chen Liu, Kamran Ul Hasan, H. Butt, Jui Fen Chang, R. H. Friend

^*Corresponding author for this work

The University of Birmingham

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

12 Citations (Scopus)

230 Downloads (Pure)

Abstract

Polymer blend system, F8_1-xSY_x, based on mixture of poly (9,9-dioctylfluorene) (F8) and a poly (para-phenylenevinylene) (PPV) copolymer, superyellow (SY), has been proven to be a high performance blend material in polymer light emitting diode (PLED). This blend system exhibits luminance (L) >10⁴cdm^-2, luminous efficiency (η) >21cdA^-1 and low operating voltage (V) ~3-10V. The performance can be credited to the large difference (~0.6eV) between the highest occupied molecular orbital (HOMO) levels of F8 (~5.8eV) and SY (~5.2eV), where, SY molecules serve as hole-traps in the F8 host polymer and reduce their mobility. This dictates a balanced charge injection into the emissive layer and results in overall increase in the device performance.

Original language	English
Pages (from-to)	62-70
Number of pages	9
Journal	Nano Energy
Volume	21
Early online date	13 Jan 2016
DOIs	https://doi.org/10.1016/j.nanoen.2015.12.023
Publication status	Published - Mar 2016

Keywords

Light emitting diodes
Poly(para-phenylenevinylenes)
Polyfluorenes
Polymer-blend diodes

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nanoen.2015.12.023Licence: None: All rights reserved

151221-Traps-Assisted-High-Effciency-Diodes-revisedAccepted author manuscript, 1.22 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

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@article{88574b6f62a544639b7e3776257d7221,

title = "Charge trap assisted high efficiency in new polymer-blend based light emitting diodes",

abstract = "Polymer blend system, F81-xSYx, based on mixture of poly (9,9-dioctylfluorene) (F8) and a poly (para-phenylenevinylene) (PPV) copolymer, superyellow (SY), has been proven to be a high performance blend material in polymer light emitting diode (PLED). This blend system exhibits luminance (L) >104cdm-2, luminous efficiency (η) >21cdA-1 and low operating voltage (V) ~3-10V. The performance can be credited to the large difference (~0.6eV) between the highest occupied molecular orbital (HOMO) levels of F8 (~5.8eV) and SY (~5.2eV), where, SY molecules serve as hole-traps in the F8 host polymer and reduce their mobility. This dictates a balanced charge injection into the emissive layer and results in overall increase in the device performance.",

keywords = "Light emitting diodes, Poly(para-phenylenevinylenes), Polyfluorenes, Polymer-blend diodes",

author = "Hassan, {M. U.} and Liu, {Yee Chen} and Hasan, {Kamran Ul} and H. Butt and Chang, {Jui Fen} and Friend, {R. H.}",

year = "2016",

month = mar,

doi = "10.1016/j.nanoen.2015.12.023",

language = "English",

volume = "21",

pages = "62--70",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier",

}

TY - JOUR

T1 - Charge trap assisted high efficiency in new polymer-blend based light emitting diodes

AU - Hassan, M. U.

AU - Liu, Yee Chen

AU - Hasan, Kamran Ul

AU - Butt, H.

AU - Chang, Jui Fen

AU - Friend, R. H.

PY - 2016/3

Y1 - 2016/3

N2 - Polymer blend system, F81-xSYx, based on mixture of poly (9,9-dioctylfluorene) (F8) and a poly (para-phenylenevinylene) (PPV) copolymer, superyellow (SY), has been proven to be a high performance blend material in polymer light emitting diode (PLED). This blend system exhibits luminance (L) >104cdm-2, luminous efficiency (η) >21cdA-1 and low operating voltage (V) ~3-10V. The performance can be credited to the large difference (~0.6eV) between the highest occupied molecular orbital (HOMO) levels of F8 (~5.8eV) and SY (~5.2eV), where, SY molecules serve as hole-traps in the F8 host polymer and reduce their mobility. This dictates a balanced charge injection into the emissive layer and results in overall increase in the device performance.

AB - Polymer blend system, F81-xSYx, based on mixture of poly (9,9-dioctylfluorene) (F8) and a poly (para-phenylenevinylene) (PPV) copolymer, superyellow (SY), has been proven to be a high performance blend material in polymer light emitting diode (PLED). This blend system exhibits luminance (L) >104cdm-2, luminous efficiency (η) >21cdA-1 and low operating voltage (V) ~3-10V. The performance can be credited to the large difference (~0.6eV) between the highest occupied molecular orbital (HOMO) levels of F8 (~5.8eV) and SY (~5.2eV), where, SY molecules serve as hole-traps in the F8 host polymer and reduce their mobility. This dictates a balanced charge injection into the emissive layer and results in overall increase in the device performance.

KW - Light emitting diodes

KW - Poly(para-phenylenevinylenes)

KW - Polyfluorenes

KW - Polymer-blend diodes

UR - http://www.scopus.com/inward/record.url?scp=84955260831&partnerID=8YFLogxK

U2 - 10.1016/j.nanoen.2015.12.023

DO - 10.1016/j.nanoen.2015.12.023

M3 - Article

AN - SCOPUS:84955260831

SN - 2211-2855

VL - 21

SP - 62

EP - 70

JO - Nano Energy

JF - Nano Energy

ER -

Charge trap assisted high efficiency in new polymer-blend based light emitting diodes

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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