Scattering quantified: Evaluation of corrugation induced outcoupling concepts in organic light-emitting diodes

被引:18
作者
Will, Paul-Anton [1 ]
Schwarz, Elisabeth Birgit
Fuchs, Cornelius
Scholz, Reinhard
Lenk, Simone
Reineke, Sebastian
机构
[1] Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, D-01187 Dresden, Germany
基金
欧盟地平线“2020”;
关键词
Organic light-emitting diodes; Outcoupling; Extraction efficiency; Scattering; Corrugation; Grating; BRAGG SCATTERING; EFFICIENCY; EXTRACTION; POLYMER; OLEDS;
D O I
10.1016/j.orgel.2018.04.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Organic light-emitting diodes (OLEDs) currently suffer mostly from only moderate outcoupling efficiencies, calling for many different photonic strategies to increase the share of extracted photons. The quantification of concepts relying on scattering based on periodic or random structures proves complicated and often deserves more attention. To evaluate light extraction methods of OLEDs, we define a procedure leading to a quantifiable extraction efficiency eta(EE) which can be calculated for top- or bottom-emitting OLEDs comprising external as well as internal outcoupling structures. Hence, the extraction efficiency allows to evaluate scattering approaches independently from the employed OLED system. A systematic study of 1D periodically corrugated red top-emitting OLEDs reveals the origin of a moderate enhancement due to an extraction efficiency of eta(EE) = 14%. Furthermore, our work provides recommendations how OLEDs with periodic corrugations should be characterized.
引用
收藏
页码:250 / 256
页数:7
相关论文
共 31 条
[21]   Extremely Efficient White Organic Light-Emitting Diodes for General Lighting [J].
Ou, Qing-Dong ;
Zhou, Lei ;
Li, Yan-Qing ;
Shen, Su ;
Chen, Jing-De ;
Li, Chi ;
Wang, Qian-Kun ;
Lee, Shuit-Tong ;
Tang, Jian-Xin .
ADVANCED FUNCTIONAL MATERIALS, 2014, 24 (46) :7249-7256
[22]  
Qu Y, 2015, NAT PHOTONICS, V9, P758, DOI [10.1038/NPHOTON.2015.194, 10.1038/nphoton.2015.194]
[23]   Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emitters [J].
Reineke, Sebastian ;
Walzer, Karsten ;
Leo, Karl .
PHYSICAL REVIEW B, 2007, 75 (12)
[24]   White organic light-emitting diodes with fluorescent tube efficiency [J].
Reineke, Sebastian ;
Lindner, Frank ;
Schwartz, Gregor ;
Seidler, Nico ;
Walzer, Karsten ;
Luessem, Bjoern ;
Leo, Karl .
NATURE, 2009, 459 (7244) :234-U116
[25]   Emitter Orientation as a Key Parameter in Organic Light-Emitting Diodes [J].
Schmidt, Tobias D. ;
Lampe, Thomas ;
Sylvinson, Daniel M. R. ;
Djurovich, Peter I. ;
Thompson, Mark E. ;
Bruetting, Wolfgang .
PHYSICAL REVIEW APPLIED, 2017, 8 (03)
[26]   Evidence for non-isotropic emitter orientation in a red phosphorescent organic light-emitting diode and its implications for determining the emitter's radiative quantum efficiency [J].
Schmidt, Tobias D. ;
Setz, Daniel S. ;
Flaemmich, Michael ;
Frischeisen, Joerg ;
Michaelis, Dirk ;
Krummacher, Benjamin C. ;
Danz, Norbert ;
Bruetting, Wolfgang .
APPLIED PHYSICS LETTERS, 2011, 99 (16)
[27]   Coherent mode coupling in highly efficient top-emitting OLEDs on periodically corrugated substrates [J].
Schwab, Tobias ;
Fuchs, Cornelius ;
Scholz, Reinhard ;
Zakhidov, Alexander ;
Leo, Karl ;
Gather, Malte C. .
OPTICS EXPRESS, 2014, 22 (07) :7524-7537
[28]   Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids [J].
Sun, Yiru ;
Forrest, Stephen R. .
NATURE PHOTONICS, 2008, 2 (08) :483-487
[29]   Optimized efficiency and angular emission characteristics of white top-emitting organic electroluminescent diodes [J].
Thomschke, Michael ;
Nitsche, Robert ;
Furno, Mauro ;
Leo, Karl .
APPLIED PHYSICS LETTERS, 2009, 94 (08)
[30]   Highly efficient organic devices based on electrically doped transport layers [J].
Walzer, K. ;
Maennig, B. ;
Pfeiffer, M. ;
Leo, K. .
CHEMICAL REVIEWS, 2007, 107 (04) :1233-1271