E-Type Delayed Fluorescence of a Phosphine-Supported Cu2(μ-NAr2)2 Diamond Core: Harvesting Singlet and Triplet Excitons in OLEDs

被引：428

作者：

Deaton, Joseph C. ^{[1
]}

Switalski, Steven C. ^{[1
]}

Kondakov, Denis Y. ^{[1
]}

Young, Ralph H. ^{[1
]}

Pawlik, Thomas D. ^{[1
]}

Giesen, David J. ^{[1
]}

Harkins, Seth B. ^{[2
]}

Miller, Alex J. M. ^{[2
]}

Mickenberg, Seth F. ^{[3
]}

Peters, Jonas C. ^{[2
]}

机构：

[1] Eastman Kodak Co, Rochester, NY 14650 USA

[2] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA

[3] MIT, Dept Chem, Cambridge, MA 02139 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 27期

基金：

美国国家科学基金会;

关键词：

LIGHT-EMITTING-DIODES; TEMPERATURE-DEPENDENCE; PHOTOPHYSICAL PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; MOLECULAR CALCULATIONS; COMPLEXES; COPPER(I); EMISSION; CHARGE; EFFICIENCY;

D O I：

10.1021/ja1004575

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A highly emissive bis(phosphine)diarylamido dinuclear copper(I) complex (quantum yield = 57%) was shown to exhibit E-type delayed fluorescence by variable temperature emission spectroscopy and photoluminescence decay measurement of doped vapor-deposited films. The lowest energy singlet and triplet excited states were assigned as charge transfer states on the basis of theoretical calculations and the small observed S-1-T-1 energy gap. Vapor-deposited OLEDs doped with the complex in the emissive layer gave a maximum external quantum efficiency of 16.1%, demonstrating that triplet excitons can be harvested very efficiently through the delayed fluorescence channel. The function of the emissive dopant in OLEDs was further probed by several physical methods, including electrically detected EPR, cyclic voltammetry, and photoluminescence in the presence of applied current.

引用

页码：9499 / 9508

页数：10

共 70 条

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