Enhanced Electroluminescence of CdSe/ZnS Quantum Dot Light–emitting Diodes with Phosphorescent Donors

2011 ◽  
Vol 1348 ◽  
Author(s):  
Yiqiang Zhang ◽  
X. A. Cao
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Organic Dyes ◽  
Effective Means ◽  
Organic Light Emitting Diodes ◽  
Exciton Energy ◽  
Light Emitting ◽  
Precise Control ◽  
Organic Light ◽  
Good Agreement

ABSTRACTWe demonstrated the enhancement of electroluminescence (EL) from green CdSe/ZnS QDs in hybrid QD/organic light-emitting diodes (QD-LEDs) by employing blue phosphorescent dyes Bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic) as efficient exciton harvesters and energy transfer donors. Precise control of the concentration of the FIrpic donors doped in a 4,4’-N, N’-dicarbazole-biphenyl (CBP) host and their distance from the QD layer led to complete triplet exciton energy transfer and EL enhancement by a factor of 2.5. The Förster distance between FIrpic molecules and green CdSe/ZnS QDs was determined to be ∼ 8 nm, which is in a good agreement with the value calculated using the Förster model. Our study shows that integrating colloidal QDs with phosphorescent organic dyes provides an effective means for improving the quantum efficiency of QD-based hybrid LEDs.

Exciton energy transfer and bi-exciton annihilation in the emitting layers of thermally activated delayed fluorescence-based OLEDs

2021 ◽  
Author(s):  
Hyunchul Kang ◽  
Han-Jin Ahn ◽  
Gyeong-Woo Kim ◽  
Ji-Eun Jeong ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Exciton Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Exciton Annihilation

Understanding the exciton energy transfer and bi-exciton annihilation processes in the emitting layers (EMLs) of thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes (OLEDs) is essential for improving their internal...

Improving CRI of white phosphorescence organic light-emitting diodes by controlling exciton energy transfer in the planar heterojunction

2020 ◽  
Vol 78 ◽  
pp. 105617
Author(s):  
Baiqian Wang ◽  
Zhiqi Kou ◽  
Qingsong Yuan ◽  
Xiang'en Fu ◽  
Zetao Fan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Exciton Energy ◽  
Light Emitting ◽  
Organic Light ◽  
Planar Heterojunction

Study of natural organic dyes as active material for fabrication of organic light emitting diodes

2016 ◽  
Author(s):  
A. Sánchez Juárez ◽  
D. Castillo ◽  
A. Guaman ◽  
S. Espinosa ◽  
D. Obregón
Keyword(s):  
Light Emitting Diodes ◽  
Organic Dyes ◽  
Active Material ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Controlled Alignment of Nanowires for Transparent Conductive Films: Methods and Applications

2021 ◽  
Vol 17 ◽  
Author(s):  
Zheng Li ◽  
Ruo-Zhou Li ◽  
Jing Yan ◽  
Ying Yu ◽  
Yuming Fang
Keyword(s):  
Effective Means ◽  
Research Work ◽  
Organic Light Emitting Diodes ◽  
Multiple Perspectives ◽  
Light Emitting ◽  
Transparent Conductive Films ◽  
Precise Control ◽  
Conductive Films ◽  
Organic Light

Background: Nanowires (NWs) have received extensive attention as the candidate materials for transparent conductive films (TCFs) in recent years. To date, the aligned nanowire (NW)-based TCFs with the same arrangement direction have shown superior characteristics to their random counterparts in applications. Objective: To fully develop the potential of NW TCFs in devices and provide inspiration for the development of subsequent NW alignment processes, this review summarizes state-of-the-art alignment techniques and emphasizes their mechanisms in detail from multiple perspectives. Methods: According to the mechanism of NW alignment, this review divides these techniques into seven categories, i.e., the assisted assembly of fluid flow, meniscus, pressure, template, electromagnetic field, contact and strain, and analyzes the characteristics of these techniques. Moreover, by briefly enumerating the applications of aligned NW films in solar cells, organic light-emitting diodes, and touch screens, the superiority of aligned NW films over random NW films is also addressed. Results: Contact-assisted assembly exhibits the best arrangement effect, reaching a 98.6% alignment degree within ±1°. Under the same conditions, shorter NWs show better alignment in several cases. The combination of various assembly techniques is also an effective means to improve the alignment effect. Conclusion: There is still room for improvement in the precise control of NW position, density and orientation in a simple, efficient and compatible process. Therefore, follow-up research work is needed to conquer these problems. Moreover, a process that can realize NW alignment and film patterning simultaneously is also a desirable scheme for fabricating personalized devices.

Recent Progress of Singlet‐Exciton‐Harvesting Fluorescent Organic Light‐Emitting Diodes by Energy Transfer Processes

2019 ◽  
Vol 31 (34) ◽  
pp. 1803714 ◽  
Author(s):  
Sung Yong Byeon ◽  
Dong Ryun Lee ◽  
Kyoung Soo Yook ◽  
Jun Yeob Lee
Keyword(s):  
Energy Transfer ◽  
Recent Progress ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Singlet Exciton ◽  
Transfer Processes ◽  
Organic Light

Organic light-emitting diodes for lighting: High color quality by controlling energy transfer processes in host-guest-systems

2012 ◽  
Vol 111 (3) ◽  
pp. 033102 ◽  
Author(s):  
Caroline Weichsel ◽  
Sebastian Reineke ◽  
Mauro Furno ◽  
Björn Lüssem ◽  
Karl Leo
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Transfer Processes ◽  
Color Quality ◽  
Organic Light

White organic light-emitting diodes based on incomplete energy transfer from perylene to rubrene

2008 ◽  
Vol 148 (5-6) ◽  
pp. 226-229 ◽  
Author(s):  
Bangdong Ding ◽  
Wenqing Zhu ◽  
Xueyin Jiang ◽  
Zhilin Zhang
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Energy transfer vs. carrier trapping: emission mechanism in dye-doped organic light emitting diodes

2002 ◽  
Vol 417 (1-2) ◽  
pp. 61-66 ◽  
Author(s):  
Y.T. Tao ◽  
C.W. Ko ◽  
E. Balasubramaniam
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Emission Mechanism ◽  
Light Emitting ◽  
Carrier Trapping ◽  
Organic Light
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