Highly Efficient Solid‐State Near‐Infrared Emitting Material Based on Triphenylamine and Diphenylfumaronitrile with an EQE of 2.58% in Nondoped Organic Light‐Emitting Diode

Han, Xiao; Bai, Qing; Yao, Liang; Liu, Haichao; Gao, Yu; Li, Jinyu; Liu, Liqun; Liu, Yulong; Li, Xiaoxiao; Lü, Ping; Yang, Bing

doi:10.1002/adfm.201503344

Cited by 189 publications

(120 citation statements)

References 49 publications

Supporting

Mentioning

113

Contrasting

Order By: Relevance

“…[14a] The oxidation potentials of PIDSB and PIDPh were similar to those of the donor group indicatingt hat the HOMO levels were determined by the PIM. From the results of the E g so f2.46 eV and 2.30 eV,t he LUMO levels of PIDSB and PIDPh were then calculated to be À3.10 eV and À3.25 eV,r espectively, from the equationo f LUMO = (HOMO + E g )e V, which was also in accordance with the literature [19] that DPFN owned the lower LUMO level and strongere lectron-withdrawing ability.…”

Section: Theoretical Calculations and Electrochemical Propertiessupporting

confidence: 80%

Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole

Liu

Man

et al. 2018

Chemistry An Asian Journal

Self Cite

View full text Add to dashboard Cite

Red emission is one of the three primary colors that are essential for the realization of full‐color displays and solid‐state lightings. A high solid‐state efficiency is a crucial factor for the applications in organic light‐emitting diodes (OLEDs). In this work, two new donor‐acceptor‐donor type phenanthro[9,10‐d]imidazole (PIM)‐based derivatives, (2Z,2′Z)‐2,2′‐(1,4‐phenylene)bis(3‐(4‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)phenyl)acrylonitrile) (PIDSB) and 2,3‐bis(4′‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)‐[1,1′‐biphenyl]‐4‐yl)fumaronitrile (PIDPh), are designed and synthesized. Both of them possess high thermal stabilities. PIDPh shows typical characteristics of aggregation‐induced emission enhancement, while PIDSB displays an aggregation‐caused quenching effect. They both exhibit significant red‐shifted emissions compared with PIM owing to intramolecular charge transfer. In the film state, the emission peaks of PIDSB and PIDPh are located at 538 nm and 605 nm with high photoluminescent quantum yields of 63.82 % and 41.26 %, respectively. The non‐doped OLED using PIDPh as the active layer shows the maximum external quantum efficiency of 2.06 % with a very low efficiency roll‐off, and exhibits the electroluminescent peak at 640 nm with a Commission Internationale de l′Éclairage coordinate of (0.617,0.396), meeting well the criteria of red OLEDs.

show abstract

Section: Theoretical Calculations and Electrochemical Propertiessupporting

confidence: 80%

Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole

Liu

Man

et al. 2018

Chemistry An Asian Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 3A, TCNT is an AIE-active near-infrared emitting dye for organic light-emitting diode. [19] The F o was enhanced from 0.9 %t o6 .2 %w hen it was polymerized into polymer P2 corresponding to a5 .8-fold enhancement ( Figure 3B). Furthermore,i fw ec hange both the types of Da nd Au nits,t he present strategy still works well.…”

mentioning

confidence: 98%

Strategies to Enhance the Photosensitization: Polymerization and the Donor–Acceptor Even–Odd Effect

et al. 2018

View full text Add to dashboard Cite

Ap articular challenge in the design of organic photosensitizers (PSs) with donor-acceptor (D-A) structures is that it is based on trial and error rather than specific rules.Now these challenges are addressed by proposing two efficient strategies to enhance the photosensitization efficiency:p olymerization-facilitated photosensitization and the D-A evenodd effect. Conjugated polymers have been found to exhibit ah igher 1 O 2 generation efficiency than their small molecular counterparts.F urthermore,P Ss with A-D-A structures show enhanced photosensitization efficiency over those with D-A-D structures.T heoretical calculations suggest an enhanced intersystem crossing (ISC) efficiency by these strategies.B oth in vitro and in vivo experiments demonstrate that the resulting materials can be used as photosensitizers in image-guided photodynamic anticancer therapy. These guidelines are applicable to other polymers and small molecules to lead to the development of new PSs.

show abstract

“…This suggests that BTT* exhibits a local excited (LE) state character, with electron localization around the core of the molecule (BTT), good spatial overlap with the hole wavefunction, and a concomitantly large singlet exciton yield. [51][52][53][54][55] Notably, the resulting exciton is thus expected to be preferentially localized on the center of the NIR emitting dye, and thereby be somewhat protected from quenching defects and impurities in the blend.…”

Section: Doi: 101002/adma201706584mentioning

confidence: 99%

Efficient Near‐Infrared Electroluminescence at 840 nm with “Metal‐Free” Small‐Molecule:Polymer Blends

et al. 2018

View full text Add to dashboard Cite

The development of efficient and biocompatible organic near-infrared emitters is attractive for many applications, spanning from photodynamic therapy [1] to light fidelity (Li-Fi) all-optical networking systems. [2][3][4] In particular, the range 700-1000 nm is interesting for medical applications, given the semitransparency of biological tissue in this spectral interval, [5] and we will specifically refer to this range as near-infrared (NIR) in the following text. Compared to conventional inorganic materials, organic NIR emitters are interesting also for their mechanical conformability, which makes them appealing for the integration in flexible and stretchable devices. [6] Furthermore, the metal-free organic light-emitting materials can be a cheap and biocompatible alternative to inorganic ones for application in wearable, implantable, or in vivo medical applications, such as for sensing of body temperature, heart and respiration rates, blood pressure, glucose level, and oxygenation. [7] In the search for ever-higher efficiencies, several classes of materials have been investigated, such as perovskite-structured methylammonium lead halides, [8][9][10] quantum dots, [11] and organometallic phosphorescent complexes. [12][13][14][15][16][17][18][19] However, although such hybrid materials afford substantial electroluminescence (EL) external quantum efficiency (EQE) in the NIR, in some cases exceeding 10% [8,10] or even 20% or so, [13] their use of heavy, toxic, and/or costly metals is not ideal for manufacturing, sustainability, environmental impact, and, in perspective, biocompatibility. Furthermore, in such hybrid systems, and in general in materials that leverage triplet excitons to boost the EQE, [20,21] exciton recombination dynamics typically fall in the hundreds of nanoseconds or even in the microsecond (or longer) range, which intrinsically limits the bandwidth when integrated in devices for telecommunications. For Li-Fi applications, [2][3][4] fluorescent molecular and polymeric materials are preferred, given that the typical fluorescence lifetime of these materials is of the order of few nanoseconds or less, thereby ideally allowing data transmission rates up to the Gb s −1 regime.In the last decade, scientists have attempted different strategies to develop heavy-metal-free NIR fluorescent organic light-emitting diodes (OLEDs), with chemical design essentially revolving around the careful combination of donor and acceptor groups to both tune the spectral range (up to 1000 nm) and maximize the EQE. [22][23][24][25][26][27][28][29][30][31][32][33] Very recently, we have, for Due to the so-called energy-gap law and aggregation quenching, the efficiency of organic light-emitting diodes (OLEDs) emitting above 800 nm is significantly lower than that of visible ones. Successful exploitation of triplet emission in phosphorescent materials containing heavy metals has been reported, with OLEDs achieving remarkable external quantum efficiencies (EQEs) up to 3.8% (peak wavelength > 800 nm). For OLEDs incorporating f...

show abstract

Highly Efficient Solid‐State Near‐Infrared Emitting Material Based on Triphenylamine and Diphenylfumaronitrile with an EQE of 2.58% in Nondoped Organic Light‐Emitting Diode

Cited by 189 publications

References 49 publications

Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole

Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole

Strategies to Enhance the Photosensitization: Polymerization and the Donor–Acceptor Even–Odd Effect

Efficient Near‐Infrared Electroluminescence at 840 nm with “Metal‐Free” Small‐Molecule:Polymer Blends

Contact Info

Product

Resources

About