2012
DOI: 10.1002/adma.201201124
|View full text |Cite
|
Sign up to set email alerts
|

Management of Singlet and Triplet Excitons in a Single Emission Layer: A Simple Approach for a High‐Efficiency Fluorescence/Phosphorescence Hybrid White Organic Light‐Emitting Device

Abstract: A high-efficiency single-emission-layer (EML) hybrid white organic light emitting device is fabricated based on an ideal sky-blue fluorophor, DADBT, using a novel doping concentration regulation strategy, which effectively separates and respectively utilizes the singlet and triplet excitons in the single-EML. The white device shows excellent electroluminescence performance with maximum total efficiencies of 26.6%, 53.5 cd A(-1) and 67.2 lm W(-1) .

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
3
1

Citation Types

3
166
0

Year Published

2012
2012
2017
2017

Publication Types

Select...
7

Relationship

0
7

Authors

Journals

citations
Cited by 238 publications
(169 citation statements)
references
References 37 publications
(26 reference statements)
3
166
0
Order By: Relevance
“…S9c-9e, the blue emission intensities of the devices are gradually increased with increasing voltage, similar to the previous reported hybrid WOLEDs. 8 with Commission International de L9Eclairage coordinates of (0.445, 0.405), exhibiting higher intensity in the orange region. 6 In addition, candle-light-style OLEDs emitting yellowish orange light have been demonstrated to be a physiologically friendly light at night.…”
Section: Resultsmentioning
confidence: 99%
See 3 more Smart Citations
“…S9c-9e, the blue emission intensities of the devices are gradually increased with increasing voltage, similar to the previous reported hybrid WOLEDs. 8 with Commission International de L9Eclairage coordinates of (0.445, 0.405), exhibiting higher intensity in the orange region. 6 In addition, candle-light-style OLEDs emitting yellowish orange light have been demonstrated to be a physiologically friendly light at night.…”
Section: Resultsmentioning
confidence: 99%
“…6 Therefore, a 'triplet harvesting' strategy by doping a blue fluorophor and red/green phosphors in separated regions of high-triplet-energy host materials has been proposed 1, 10 and is further improved by incorporating blue fluorophors with high triplet energy (T 1 ) to prevent the undesirable 'back energy transfer' from the phosphors to the blue fluorophors. 2,7,8 However, the heavy metal in the phosphors introduce an external heavy-atom effect (EHA) in the emissive layer (EML) and may lead to quenching of the fluorescence due to the increased singlet (S 1 )-triplet (T 1 ) intersystem crossing (ISC) rate (k ISC ) constant and the radiative or non-radiative decay rate of triplet excitons (k p ) of the fluorophors. [11][12][13] This process could be another possible mechanism of energy loss in hybrid WOLEDs, especially for the WOLED with a single EML, even though this process has been ignored in previous studies.…”
Section: Introductionmentioning
confidence: 99%
See 2 more Smart Citations
“…In order to achieve high device efficiency, phosphorescent materials have been widely used to fabricate such devices because they allow manufacturers to harvest 25% singlet excitons and 75% triplet excitons, thus achieving internal quantum efficiency of 100%, compared with the 25% theoretical value for fluorescent materials [3][4][5][6][7][8]. However, the all-phosphorescent WOLEDs are limited by i) the absence of efficient blue phosphors with long operational lifetimes that are suitable for commercial applications [9,10], and ii) the difficulty of conducting carrier injection from an adjacent carrier transporting layer to the large-bandgap host material with higher triplet state energy [11]. Thus, one promising approach to achieve WOLEDs with high efficiency and long lifetime is to combine emissions from blue fluorophores and long wavelength phosphors, also called fluorescence/ phosphorescence (F/P)-based hybrid WOLEDs.…”
Section: Introductionmentioning
confidence: 99%