Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes

Tagare, Jairam; Ulla, Hidayath; Kajjam, Aravind Babu; Satyanarayan, M. N.; Vaidyanathan, Sivakumar

doi:10.1002/slct.201700056

Cited by 14 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relation between the dipole moment of solute and solvents can be defined by the Lippert‐Mataga model. The Equations ((1) and (2)) of Lippert‐Mataga describe the Stokes shift (cm −1 ) as a function of change in dipole moment (Δμ ge =μ e ‐ μ g ) [52–54] .

true h c (() v_{a} - v_{f}) = h c (() v_{a}^{o} - v_{f}^{o}) - \frac{2 {(() μ_{e} - μ_{g})}^{2}}{a^{3}} f (() ϵ, n)

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Deep‐blue Fluorophores Based on Phenanthroimidazole Integrated with Benzo[d]thiazole: Experimental and Theoretical Investigation

et al. 2022

Self Cite

View full text Add to dashboard Cite

Three deep-blue emissive donor-acceptor (DÀ A) fluorophores, 2-(4'-(1-(4-(tert-butyl)phenyl)-1H-phenanthro [9,10-d] 10d]imidazol-1-yl)benzonitrile (m-CNPISN) based on benzothiazole with varying substituents at N1-position to tune the properties of the materials were designed and synthesized. The synthesized fluorophores were structurally confirmed by spectroscopic techniques. All the fluorophores exhibited good thermal properties with high thermal degradation temperatures. An optical study reveals that the fluorophores are capable of emitting in the blue spectral region in solution and solid. The quantum chemical investigations were also performed with the aim to understand the electronic structures of the fluorophores. Further, solution-processed OLED device was fabricated by using PTPISN as an emissive dopant and found that bright deep-blue electroluminescence with CIEy of (∼ 0.08). These results suggest that the introduction of benzothiazole moiety is a promising design strategy for obtaining new deep-blue emitters.

show abstract

true h c (() v_{a} - v_{f}) = h c (() v_{a}^{o} - v_{f}^{o}) - \frac{2 {(() μ_{e} - μ_{g})}^{2}}{a^{3}} f (() ϵ, n)

…”

Section: Resultsmentioning

confidence: 99%

“…The Equations ((1) and ( 2)) of Lippert-Mataga describe the Stokes shift (cm À 1 ) as a function of change in dipole moment (Δμ ge = μ e -μ g ). [52][53][54]…”

Section: Chemistryselectmentioning

confidence: 99%

Deep‐blue Fluorophores Based on Phenanthroimidazole Integrated with Benzo[d]thiazole: Experimental and Theoretical Investigation

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The doped device made up of these molecules exhibited bluish-green emission at 436 nm with high efficiency (current efficiency of 6.58 Cd/A, PE of 5.91 lm/W and 3.62% EQE at low turn-on voltage of 2.83 V). 60…”

Section: Progress Of Blue Light Emitters In Indiamentioning

confidence: 99%

A Review on the Milestones of Blue Light-Emitting Materials in India

et al. 2023

View full text Add to dashboard Cite

Since 1987 in the field of optoelectronics, organic light-emitting diodes (OLEDs) have secured their position because of their extreme use in panels of lighting applications such as TV and smartphone displays. At present, OLEDs are at top-notch position in the lighting market for their promising features. The field of OLEDs is rapidly growing day by day in academia and industry due to the success of OLEDs in the form of excellent efficiency, feasible methods, excellent lifetime, color purity, and superb device architecture. As a result, OLEDs are new profitable leading devices of the 21st century. However, the OLED industry has evolved in optoelectronics in the last 30 years and is advancing rapidly just because of the development in OLED materials (fluorescent, phosphorescent, thermally activated delayed fluorescent, and blue light-emitting materials). Blue light-emitting materials have achieved incredible popularity nationally and internationally. At the international level, USA, Japan, Korea, and Germany are at the top of the list in the production of OLEDs. India has also seen rapid progress in OLED development in the last 12 years and details of research in blue OLEDs by key players of India are involved in this report.1 Introduction1.1 OLED Construction1.2 Working of OLED2 OLED Development2.1 Historical Background of OLED2.1.1 International Status2.1.2 National Status3 Progress of Blue Emitters in India4 Present Scenario of Blue OLEDs5 Conclusions and Outlook

show abstract

“…[39] The optical bandgaps of the fluorophores were calculated from the diffuse reflectance spectra (DRS) with the help of the Kubelka-Munk function (Figure 4c). [40,41] The obtained band gaps are listed in Table 2. Absorption spectra for all fluorophores in thin films were found to be broad and red shifted compared with in solution (310, 385 nm).…”

Section: Powder Xrd Studiesmentioning

confidence: 99%

Phenanthroimidazole‐based chromophores for organic light‐emitting diodes: synthesis, photophysical, and theoretical study

et al. 2020

Self Cite

View full text Add to dashboard Cite

Organic light‐emitting diodes (OLED) are gaining attention and making a significant contribution to the area of lighting and displays technology. The synthesis of new materials that can act as a host as well as emissive materials is crucial and efforts have been made in this direction in this research. Here, four star‐shaped fluorophores, with a donor–acceptor (D–A) structure and with triphenylamine and phenanthroimidazole groups with different substitutions at the N1 position of the imidazole moiety, were designed and synthesized. Synthesized fluorophores showed sufficient thermal stability (10% Td in the range 230–280°C). Ultraviolet–visible (UV–vis) spectra of the fluorophores showed multiple absorption bands (bands in the UV region, due to π–π* transitions of the conjugated aromatic portion) and all fluorophores showed blue emission in dichloromethane solution. Electrochemical analysis indicated that all fluorophores had excellent oxidation and reduction characteristics. Theoretical calculations were also performed to better understand the structural and electronic properties of the synthesized fluorophores. All fluorophores had higher triplet (T1) energy (ranging from 2.49–2.52 eV) than the widely used green (Ir(ppy)3 –2.4 eV) and red (Ir (piq)2 acac – 2.2 eV) dopant materials. These results indicated that these fluorophores would be useful as host materials for efficient green and red phosphorescent OLEDs.

show abstract

Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes

Cited by 14 publications

References 43 publications

Deep‐blue Fluorophores Based on Phenanthroimidazole Integrated with Benzo[d]thiazole: Experimental and Theoretical Investigation

Deep‐blue Fluorophores Based on Phenanthroimidazole Integrated with Benzo[d]thiazole: Experimental and Theoretical Investigation

A Review on the Milestones of Blue Light-Emitting Materials in India

Phenanthroimidazole‐based chromophores for organic light‐emitting diodes: synthesis, photophysical, and theoretical study

Contact Info

Product

Resources

About