IRIDIUM COMPLEXES WITH 3-METHYL-2,4-PENTANEDIONE LIGAND FOR ORGANIC ELECTROLUMINESCENT DEVICE

2005 ◽  
Vol 14 (04) ◽  
pp. 529-534 ◽  
Author(s):  
DONG UK KIM ◽  
SEOUNG-HEY PAIK ◽  
SUNG-HOON KIM ◽  
YOON-HEUNG TAK ◽  
SANG-DAE KIM ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Iridium Complexes ◽  
Electroluminescent Device ◽  
Organic Electroluminescent ◽  
Current Densities

Phosphorescent materials, IR-FPPA1, IR-PPA1 and IR-TPA1 as emission dopants for electroluminescent (EL) devices were synthesized. Three types of devices such as ITO/ NPD/IR-FPPA1 (6%), IR-PPA1 (6%) and IR-TPA1 (6%) in CBP/BCP/Alq/LiF/Al were fabricated. IR-FPPA1, IR-PPA1 and IR-TPA1 exhibited 540 Cd/m2, 6600 Cd/m2 and 590 Cd/m2 with their external quantum efficiency of 1.2%, 8.9% and 3.0% in current densities of 20 mA/cm2, respectively. EL spectra of the IR-FPPA1, IR-PPA1, and IR-TPA1 devices had the band maxima at 490 nm, 535 nm and 615 nm, respectively.

Efficient electroluminescence of bluish green iridium complexes with 2-(3,5-bis(trifluoromethyl)phenyl)pyrimidine and 2-(3,5-bis(trifluoromethyl)phenyl)-5-fluoropyrimidine as the main ligands

2018 ◽  
Vol 5 (7) ◽  
pp. 1545-1552 ◽  
Author(s):  
Hua-Bo Han ◽  
Zheng-Guang Wu ◽  
You-Xuan Zheng
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Iridium Complexes ◽  
Bluish Green ◽  
Maximum Current

Four bluish green iridium complexes with high photoluminescence quantum efficiencies were applied in OLEDs, and they showed a maximum current efficiency of 74.70 cd A−1 and a maximum external quantum efficiency of 35.0% with mild efficiency roll-off.

Efficient bluish green electroluminescence of iridium complexes with good electron mobility

2018 ◽  
Vol 42 (16) ◽  
pp. 13351-13357 ◽  
Author(s):  
Hua-Bo Han ◽  
Zheng-Guang Wu ◽  
You-Xuan Zheng
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
Electron Mobility ◽  
External Quantum Efficiency ◽  
Iridium Complexes ◽  
Bluish Green ◽  
Maximum Current

Two efficient bluish green iridium complexes with good electron mobility were applied in efficient OLEDs, showing a maximum current efficiency of 71.18 cd A−1 and a maximum external quantum efficiency of 27.7%.

Synthesis and optical properties of phenanthromidazole derivatives for organic electroluminescent devices

2015 ◽  
Vol 39 (1) ◽  
pp. 142-154 ◽  
Author(s):  
Jayaraman Jayabharathi ◽  
Periyasamy Ramanathan ◽  
Venugopal Thanikachalam
Keyword(s):  
Optical Properties ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Electroluminescent Devices ◽  
Organic Electroluminescent ◽  
Triplet Triplet Annihilation

The external quantum efficiency roll-off may be due to triplet–triplet annihilation (TTA) and triplet–polaron annihilation (TPA).

White light-emitting organic electroluminescent device based on a new orange organometallic iridium complexes

2007 ◽  
Author(s):  
Tien-shou Shieh ◽  
Heh-lung Huang ◽  
Pey-ching Liu ◽  
Mei-Rurng Tseng ◽  
Jia-Ming Liu
Keyword(s):  
White Light ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Electroluminescent Device ◽  
Organic Electroluminescent

Suppression of external quantum efficiency roll-off of nanopatterned organic-light emitting diodes at high current densities

2015 ◽  
Vol 118 (15) ◽  
pp. 155501 ◽  
Author(s):  
Hiroyuki Kuwae ◽  
Atsushi Nitta ◽  
Kou Yoshida ◽  
Takashi Kasahara ◽  
Toshinori Matsushima ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
High Current ◽  
Light Emitting ◽  
Organic Light ◽  
Current Densities

Synthesis and electrophosphorescence of novel heteroleptic iridium complexes based on thiazole-containing ligands

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34198-34203 ◽  
Author(s):  
Di Liu ◽  
Ruijuan Yao ◽  
Min Fu ◽  
Deli Li ◽  
Shufen Zhang
Keyword(s):  
Aromatic Ring ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Organic Light

Novel heteroleptic iridium complexes containing aromatic-ring-fused-thiazole in cyclometalating ligands are developed and exhibit a maximum external quantum efficiency of 22.2% in orange phosphorescent organic light-emitting diodes.

Highly efficient yellow electroluminescence of iridium complexes with good electron mobility

2018 ◽  
Vol 2 (7) ◽  
pp. 1284-1290 ◽  
Author(s):  
Hua-Bo Han ◽  
Xiao-Feng Ma ◽  
Zheng-Guang Wu ◽  
You-Xuan Zheng
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
Electron Mobility ◽  
External Quantum Efficiency ◽  
Iridium Complexes ◽  
Highly Efficient ◽  
Maximum Current ◽  
Low Efficiency

Herein, two efficient yellow iridium complexes with good electron mobility were applied in OLEDs, showing a maximum current efficiency of 106.66 cd A−1 and an external quantum efficiency of 29.7% with low efficiency roll-off.

Green phosphorescent organic electroluminescent devices with 27.9% external quantum efficiency by employing a terbium complex as a co-dopant

2019 ◽  
Vol 7 (26) ◽  
pp. 7953-7958 ◽  
Author(s):  
Rongzhen Cui ◽  
Weiqiang Liu ◽  
Liang Zhou ◽  
Xuesen Zhao ◽  
Yunlong Jiang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Rare Earth Complexes ◽  
Operating Voltage ◽  
Terbium Complex ◽  
Electroluminescent Devices ◽  
Organic Electroluminescent ◽  
Trivalent Rare Earth ◽  
Bright Green

Bright green organic electroluminescent devices with a low operating voltage and high efficiencies were realized by utilizing trivalent rare earth complexes as co-dopants.

scholarly journals The Quantum Efficiency Roll-Off Effect in Near-Infrared Organic Electroluminescent Devices with Iridium Complexes Emitters

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1855
Author(s):  
Wojciech Mróz ◽  
Sagar Kesarkar ◽  
Alberto Bossi ◽  
Daniel Pelczarski ◽  
Piotr Grygiel ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Iridium Complexes ◽  
Host Matrix ◽  
Applied Model ◽  
Organic Systems ◽  
Fitting Procedure ◽  
Organic Electroluminescent ◽  
Electron Hole Pair ◽  
Emission Quenching

The electroluminescence quantum efficiency roll-off in iridium(III)-based complexes, namely Ir(iqbt)2(dpm) and Ir(iqbt)3 (iqbt = 1 (benzo[b]thiophen-2-yl)-isoquinolinate, dpm = 2,2,6,6-tetramethyl-3,5-heptanedionate) utilized as near-infrared emitters in organic light emitting diodes with remarkable external quantum efficiencies, up to circa 3%, 1.5% and 1%, are measured and analyzed. With a 5–6 weight% of emitters embedded in a host matrix, the double-layer solution-processed structure as well as analogous three-layer one extended by a hole-conducting film are investigated. The triplet-polaron, the Onsager electron-hole pair dissociation and the triplet-triplet annihilation approaches were used to reproduce the experimental data. The mutual annihilation of triplets in iridium emitters was identified as prevailingly controlling the moderate roll-off, with the interaction between those of iridium emitters and host matrixes found as being less probable. Following the fitting procedure, the relevant rate constant was estimated to be ( 0.5 − 12 ) × 10 − 12 cm3/s, values considered to be rather too high for disordered organic systems, which was assigned to the simplicity of the applied model. A coexistence of some other mechanisms is therefore inferred, ones, however, with a less significant contribution to the overall emission quenching.

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