Converting an organic light-emitting diode from blue to white with bragg modes

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@article{b62ca03386e543e1b2a7eedb603043eb,
title = "Converting an organic light-emitting diode from blue to white with bragg modes",
abstract = "Organic light-emitting diodes (OLEDs) have been established as versatile light sources that allow for easy integration in large-area surfaces and flexible substrates. In addition, the low fabrication cost of OLEDs renders them particularly attractive as general lighting sources. Current methods for the fabrication of white-light OLEDs rely on the combination of multiple organic emitters and/or the incorporation of multiple cavity modes in a thick active medium. These architectures introduce formidable challenges in both device design and performance improvements, namely, the decrease of efficiency with increasing brightness (efficiency roll-off) and short operational lifetime. Here we demonstrate, for the first time, white-light generation in an OLED consisting of a sub-100 nm thick blue single-emissive layer coupled to the photonic Bragg modes of a dielectric distributed Bragg reflector (DBR). We show that the Bragg modes, although primarily located inside the DBR stack, can significantly overlap with the emissive layer, thus efficiently enhancing emission and outcoupling of photons at selected wavelengths across the entire visible light spectrum. Moreover, we show that color temperature can be tuned by the DBR parameters, offering great versatility in the optimization of white-light emission spectra.",
keywords = "distributed Bragg reflector, electroluminescence color conversion, Fabry-P{\'e}rot modes, organic semiconductors, white organic light-emitting diodes (WOLEDs)",
author = "Daskalakis, {Konstantinos S.} and Francisco Freire-Fern{\'a}ndez and Moilanen, {Antti J.} and {Van Dijken}, Sebastiaan and P{\"a}ivi T{\"o}rm{\"a}",
note = "| openaire: EC/H2020/745115/EU//OPLD",
year = "2019",
month = "10",
day = "8",
doi = "10.1021/acsphotonics.9b01206",
language = "English",
volume = "6",
pages = "2655--2662",
journal = "ACS Photonics",
issn = "2330-4022",
number = "11",

}

RIS - Lataa

TY - JOUR

T1 - Converting an organic light-emitting diode from blue to white with bragg modes

AU - Daskalakis, Konstantinos S.

AU - Freire-Fernández, Francisco

AU - Moilanen, Antti J.

AU - Van Dijken, Sebastiaan

AU - Törmä, Päivi

N1 - | openaire: EC/H2020/745115/EU//OPLD

PY - 2019/10/8

Y1 - 2019/10/8

N2 - Organic light-emitting diodes (OLEDs) have been established as versatile light sources that allow for easy integration in large-area surfaces and flexible substrates. In addition, the low fabrication cost of OLEDs renders them particularly attractive as general lighting sources. Current methods for the fabrication of white-light OLEDs rely on the combination of multiple organic emitters and/or the incorporation of multiple cavity modes in a thick active medium. These architectures introduce formidable challenges in both device design and performance improvements, namely, the decrease of efficiency with increasing brightness (efficiency roll-off) and short operational lifetime. Here we demonstrate, for the first time, white-light generation in an OLED consisting of a sub-100 nm thick blue single-emissive layer coupled to the photonic Bragg modes of a dielectric distributed Bragg reflector (DBR). We show that the Bragg modes, although primarily located inside the DBR stack, can significantly overlap with the emissive layer, thus efficiently enhancing emission and outcoupling of photons at selected wavelengths across the entire visible light spectrum. Moreover, we show that color temperature can be tuned by the DBR parameters, offering great versatility in the optimization of white-light emission spectra.

AB - Organic light-emitting diodes (OLEDs) have been established as versatile light sources that allow for easy integration in large-area surfaces and flexible substrates. In addition, the low fabrication cost of OLEDs renders them particularly attractive as general lighting sources. Current methods for the fabrication of white-light OLEDs rely on the combination of multiple organic emitters and/or the incorporation of multiple cavity modes in a thick active medium. These architectures introduce formidable challenges in both device design and performance improvements, namely, the decrease of efficiency with increasing brightness (efficiency roll-off) and short operational lifetime. Here we demonstrate, for the first time, white-light generation in an OLED consisting of a sub-100 nm thick blue single-emissive layer coupled to the photonic Bragg modes of a dielectric distributed Bragg reflector (DBR). We show that the Bragg modes, although primarily located inside the DBR stack, can significantly overlap with the emissive layer, thus efficiently enhancing emission and outcoupling of photons at selected wavelengths across the entire visible light spectrum. Moreover, we show that color temperature can be tuned by the DBR parameters, offering great versatility in the optimization of white-light emission spectra.

KW - distributed Bragg reflector

KW - electroluminescence color conversion

KW - Fabry-Pérot modes

KW - organic semiconductors

KW - white organic light-emitting diodes (WOLEDs)

UR - http://www.scopus.com/inward/record.url?scp=85073680090&partnerID=8YFLogxK

U2 - 10.1021/acsphotonics.9b01206

DO - 10.1021/acsphotonics.9b01206

M3 - Article

VL - 6

SP - 2655

EP - 2662

JO - ACS Photonics

JF - ACS Photonics

SN - 2330-4022

IS - 11

ER -

ID: 38195865