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

Department of Optics and Photonics

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

12 Scopus citations

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
DOIs	https://doi.org/10.1016/j.nanoen.2015.12.023
State	Published - 1 Mar 2016

Keywords

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

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10.1016/j.nanoen.2015.12.023

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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.}",

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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 - 2016/3/1

Y1 - 2016/3/1

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

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DO - 10.1016/j.nanoen.2015.12.023

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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

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