2-Phenyl-1,2,3-benzotriazole Ir(III) complexes with additional donor fragment for single-layer PhOLED devices

Tomkute-Luksiene, Daiva; Keruckas, Jonas; Malinauskas, Tadas; Simokaitienė, Jūratė; Getautis, Vytautas; Gražulevičius, Juozas V.; Volyniuk, Dmytro; Cherpak, Vladyslav; Stakhira, Pavlo; Yashchuk, Valeriy V.; Kosach, V.; Luka, G.; Sidaravičius, Jonas

doi:10.1016/j.dyepig.2012.08.012

Cited by 19 publications

(13 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high-energy absorption bands (330–370 nm) originated from ligand to ligand charge transfer (LLCT) and intraligand charge transfer (ILCT), which are related to the spin-allowed 1 π–π* transitions (Figure S1). ,, Because of the high polarizability of a Se atom, both high-energy and low-energy bands of absorption spectra of selenium-containing complexes were found to be red-shifted in comparison to those of many other iridium complexes, including S-, N-, B-, Si-, and PO-containing iridium complexes. , It is worth noting that absorption spectra of the solutions of all the developed complexes 5 – 7 were red-shifted in comparison to those of rare examples of previously published selenium-containing iridium phosphorescent emitters, displaying the efficiency of the design strategy presented here. , Similar absorption spectra were observed for dilute tetrahydrofuran (THF) solutions and solid layers of complexes 5 – 7 (Figure S1). Slight red shifts of absorption spectra of solid films were detected in comparison to the corresponding absorption spectra of toluene and THF solutions, displaying weak aggregation effects (Table and Figure S1).…”

Section: Results and Discussionmentioning

confidence: 83%

Synthesis and Performance in OLEDs of Selenium-Containing Phosphorescent Emitters with Red Emission Color Deeper Than the Corresponding NTSC Standard

et al. 2019

View full text Add to dashboard Cite

The synthesis of new iridium(III) complexes containing a 2-(benzo[b]selenophen-2-yl)pyridine ligand is reported along with their photophysical, thermal, electrochemical and electroluminescent properties. These complexes are characterized by deep red phosphorescence with photoluminescence quantum yields exceeding 31% in the solid state. Solid layers of the complexes were characterized by ionization potentials of 5.17–5.27 eV and electron affinities of 2.87–2.95 eV. Their thermal and electrochemical stabilities were proved by cyclic voltammetry and thermogravimetric analysis. Deep red selenium-based iridium phosphorescent emitters were used in red electroluminescent devices which were characterized by a deep red color with Commission Internationale de l’Eclairage (CIE 1931) chromaticity coordinates (x, y) of (0.69, 0.31). This color is deeper than that defined by the red color standard (0.67, 0.33) of the National Television System Committee (NTSC) or CIE 1931 of (0.68, 0.32) of the widely known red phosphorescent emitter bis(1-phenylisoquinoline)(acetylacetonate)iridium(III) (Ir(piq)2(acac)). Using newly developed deep red iridium complexes, white hybrid wet-processable light-emitting devices were fabricated, the electroluminescence of which was characterized by a white color with a color rendering index (CRI) reaching 85. White hybrid OLEDs were obtained by mixing blue fluorescence, green thermally activated delayed fluorescence, and red phosphorescence. They showed a maximum brightness exceeding 10000 cd/m2 and a high external quantum efficiency of 6.3% as for solution-processed white devices.

show abstract

Section: Results and Discussionmentioning

confidence: 83%

Synthesis and Performance in OLEDs of Selenium-Containing Phosphorescent Emitters with Red Emission Color Deeper Than the Corresponding NTSC Standard

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In 2013, the 1,1‐bis(4‐(3',3”‐dimethoxy)triphenylamino)cyclohexane, CBM4, which only possesses electron‐rich fragments has been used as host for a red‐emitting 1,2,3‐triazole‐based iridium complex (Bis(5‐bis[(4‐methylphenyl)amino]‐2‐phenyl‐1,2,3‐benzotriazolato‐N,C2′) Iridium(III)(acetyl‐acetonate): IC1) bearing hole‐transporting diphenylamine moieties. [ 93 ] With an E T of 2.85 eV, CBM4 is adapted to host IC1, which possesses an E T of 2.02 eV. EL maxima of the SL‐PhOLED D64 are detected at 610 and 652 nm with CIE coordinates (0.65, 0.35), which correspond to IC1 emission.…”

Section: Part I Single‐layer Pholedsmentioning

confidence: 99%

“…CBM4, already used as host for a red phosphor IC1 (device D64), has also been used as host for the orange‐yellow emitting 1,2,3‐triazole‐based iridium complex (IC2 for bis(5‐(9‐carbazolyl)‐2‐phenyl‐1,2,3‐benzotriazolato‐ N , C 2 ′) iridium(III)(acetyl‐acetonate)) bearing carbazole hole transporting moieties. [ 93 ] With an E T of 2.85 eV, CBM4 is adapted to host IC2, which possesses an E T of 2.11 eV. EL maxima of device D73 using CBM4:IC2 10% as EML are recorded at 562 and 600 nm (CIE: 0.53, 0.47).…”

Section: Part I Single‐layer Pholedsmentioning

confidence: 99%

Designing Host Materials for the Emissive Layer of Single‐Layer Phosphorescent Organic Light‐Emitting Diodes: Toward Simplified Organic Devices

Poriel

Rault‐Berthelot

2021

Adv Funct Materials

View full text Add to dashboard Cite

Thanks to the tremendous effort over the last 20 years, phosphorescent organic light‐emitting diodes (PhOLEDs) represent a prevalent technology. In this technology, all the high‐efficiency PhOLEDs are multi‐layer devices constituting, in addition to the emissive layer (EML), of a stack of functional organic layers. These layers play a crucial role in the device performance as they improve the injection, transport, and recombination of charges within the EML. Single‐layer PhOLEDs (SL‐PhOLEDs) represent ideal OLEDs, consisting only of the electrodes and the EML. However, reaching high‐performance SL‐PhOLED is far from easy, as removing the functional layers of an OLED stack dramatically decreases the performance. To achieve high SL‐PhOLED efficiency, the efficient injection, transport, and recombination of charges should be insured by the EML, and particularly, by the host material. In the present exhaustive review, the different molecular design strategies are analyzed, which have been used to construct high‐efficiency hosts for SL‐PhOLED. The impact of the electronic properties (triplet energy, HOMO/LUMO energy, mobility etc.) on the device characteristics (threshold voltage, electroluminescent spectrum, external quantum efficiency, etc.) are discussed. This allows to draw a structure/properties/device performance relationship map of interest for the future design of functional materials for SL‐PhOLEDs.

show abstract

“…It has also been shown that SL‐PhOLEDs can display better stability than their multilayer counterparts, which is a very important feature for this technology. However, removing the functional organic layers of a PhOLED stack leads to a dramatic decrease of the performance and high‐efficiency SL‐PhOLEDs (red, yellow, orange, green, blue, and white) are rarely reported in literature. Blue SL‐PhOLEDs particularly represent the most difficult challenge to address (due to the high triplet energy level, E T , above 2.6 eV, of blue phosphors) and only very few examples have been reported to date .…”

Section: Introductionmentioning

confidence: 99%

Spirophenylacridine‐2,7‐(diphenylphosphineoxide)‐fluorene: A Bipolar Host for High‐Efficiency Single‐Layer Blue Phosphorescent Organic Light‐Emitting Diodes

Lucas

Ibraikulov

Quinton

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

Herein, a high‐efficiency host material for single‐layer phosphorescent organic light‐emitting diodes (SL‐PhOLEDs) is reported. This host material is synthesized via an efficient approach and is constructed on the association of an electron‐rich phenylacridine unit connected by a spiro carbon atom to an electron‐deficient 2,7‐bis(diphenylphosphineoxide)‐fluorene. In addition to a high ET value and adequate highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels, the key point in this molecular design is the suitable balance between hole and electron mobilities, which leads to a high‐performance blue SL‐PhOLED with an external quantum efficiency of 17.6% (current efficiency = 37.8 cd A−1 and power efficiency = 37.1 lm W−1) and a low Von of 2.5 V. This performance shows that the molecular design of the present host fulfills the criteria required for high‐efficiency SL‐PhOLEDs. The present performance is one of the highest reported to date for blue SL‐PhOLEDs and more importantly shows the potential of such a molecular design to reach very high‐performance single‐layer devices.

show abstract

2-Phenyl-1,2,3-benzotriazole Ir(III) complexes with additional donor fragment for single-layer PhOLED devices

Cited by 19 publications

References 35 publications

Synthesis and Performance in OLEDs of Selenium-Containing Phosphorescent Emitters with Red Emission Color Deeper Than the Corresponding NTSC Standard

Synthesis and Performance in OLEDs of Selenium-Containing Phosphorescent Emitters with Red Emission Color Deeper Than the Corresponding NTSC Standard

Designing Host Materials for the Emissive Layer of Single‐Layer Phosphorescent Organic Light‐Emitting Diodes: Toward Simplified Organic Devices

Spirophenylacridine‐2,7‐(diphenylphosphineoxide)‐fluorene: A Bipolar Host for High‐Efficiency Single‐Layer Blue Phosphorescent Organic Light‐Emitting Diodes

Contact Info

Product

Resources

About