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

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...

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.

scholarly journals Managing excitons for high performance hybrid white organic light-emitting diodes by using a simple planar heterojunction interlayer

2018 ◽  
Vol 112 (2) ◽  
pp. 023301 ◽  
Author(s):  
Changsheng Shi ◽  
Ning Sun ◽  
Zhongbin Wu ◽  
Jiangshan Chen ◽  
Tansir Ahamad ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Planar Heterojunction

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

High Efficient White Organic Light-Emitting Diodes Using BCzVBi as Blue Fluorescent Dopant

2008 ◽  
Vol 8 (9) ◽  
pp. 4579-4583
Author(s):  
You-Hyun Kim ◽  
Su-Hwan Lee ◽  
Hyun-Soo Yoon ◽  
Jae-Yoon Choi ◽  
Sung Sik Shin ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Efficiency Improvement ◽  
Light Emitting ◽  
Organic Light ◽  
High Efficient

Efficiency improvement and color optimization of white organic light-emitting diodes (WOLEDs) were achieved via employing blue host DPVBi doped with blue fluorescent, BCzVBi. The structure of high efficient WOLED device was composed of ITO/NPB/DPVBi:BCzVBi-6%/MADN:DCM2-0.5%/Bphen/Liq/Al. WOLED doped by blue fluorescent BCzVBi exhibits 6.19 cd/A of luminous efficiency and 15400 cd/m2 of maximum luminescence. It also performs 480 cd/m2 of luminance at 5.7 V and 15,400 cd/m2 at 12.9 V with CIEx,y coordinates of (0.33, 0.32) and (0.32, 0.32), respectively. Hole carrier and energy transfer from DPVBi to BCzVBi are proposed to explain the observed phenomena.

Sign in / Sign up

Export Citation Format

Share Document