Effects of Charge Balance and Exciton Confinement on the Operational Lifetime of Blue Phosphorescent Organic Light-Emitting Diodes

被引：24

作者：

Coburn, Caleb ^{[1
]}

Forrest, Stephen R. ^{[1
,2
,3
]}

机构：

[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW APPLIED | 2017年 / 7卷 / 04期

关键词：

ACTIVATED DELAYED FLUORESCENCE; OPTICAL-PROPERTIES; DEVICES; DEGRADATION; TRANSPORT; STABILITY; EMISSION;

D O I：

10.1103/PhysRevApplied.7.041002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We measure the contribution of loss of charge balance and exciton confinement in the emission zone to the operational lifetime of blue phosphorescent organic light-emitting diodes (PHOLEDs). Charge balance and exciton confinement are monitored as functions of time by measuring the emission intensity of either phosphorescent or fluorescent red-emitting "sensing" layers embedded within the charge-transport layers outside of the emission zone. We find no significant change in charge balance over the lifetime of the device, while loss of exciton confinement accounts for < 5% of luminance loss, confirming that degradation is primarily due to decomposition of molecular constituents within the emission layer of the PHOLED.

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页数：5

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共 24 条

[1] Degradation mechanism of small molecule-based organic light-emitting devices [J].

Aziz, H ;

Popovic, ZD ;

Hu, NX ;

Hor, AM ;

Xu, G .

SCIENCE, 1999, 283 (5409) :1900-1902

[2] Highly efficient phosphorescent emission from organic electroluminescent devices [J].

Baldo, MA ;

O'Brien, DF ;

You, Y ;

Shoustikov, A ;

Sibley, S ;

Thompson, ME ;

Forrest, SR .

NATURE, 1998, 395 (6698) :151-154

[3] Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transfer [J].

Baldo, MA ;

Forrest, SR .

PHYSICAL REVIEW B, 2000, 62 (16) :10958-10966

[4] Absorption and emission spectroscopic characterization of platinum-octaethyl-porphyrin (PtOEP) [J].

Bansal, A. K. ;

Holzer, W. ;

Penzkofer, A. ;

Tsuboi, Taiju .

CHEMICAL PHYSICS, 2006, 330 (1-2) :118-129

[5] Characterization of the triplet state of tris(8-hydroxyquinoline)aluminium(III) in benzene solution [J].

Burrows, HD ;

Fernandes, M ;

de Melo, JS ;

Monkman, AP ;

Navaratnam, S .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2003, 125 (50) :15310-15311

[6] Simplified calculation of dipole energy transport in a multilayer stack using dyadic Green's functions [J].

Celebi, K. ;

Heidel, T. D. ;

Baldo, M. A. .

OPTICS EXPRESS, 2007, 15 (04) :1762-1772

[7] Charge Balance and Exciton Confinement in Phosphorescent Organic Light Emitting Diodes [J].

Coburn, Caleb ;

Lee, Jaesang ;

Forrest, Stephen R. .

ADVANCED OPTICAL MATERIALS, 2016, 4 (06) :889-895

[8] Investigating the Role of Emissive Layer Architecture on the Exciton Recombination Zone in Organic Light-Emitting Devices [J].

Erickson, Nicholas C. ;

Holmes, Russell J. .

ADVANCED FUNCTIONAL MATERIALS, 2013, 23 (41) :5190-5198

[9] Tetradentate Pt(II) Complexes with 6-Membered Chelate Rings: A New Route for Stable and Efficient Blue Organic Light Emitting Diodes [J].

Fleetham, Tyler B. ;

Huang, Liang ;

Klimes, Kody ;

Brooks, Jason ;

Li, Jian .

CHEMISTRY OF MATERIALS, 2016, 28 (10) :3276-3282

[10] Organic light-emitting diode (OLED) technology: materials, devices and display technologies [J].

Geffroy, Bernard ;

le Roy, Philippe ;

Prat, Christophe .

POLYMER INTERNATIONAL, 2006, 55 (06) :572-582