A new electron transporting material for effective hole-blocking and improved charge balance in highly efficient phosphorescent organic light emitting diodes

Yoo, Shin; Yun, Hui‐Jun; Kang, Il‐Suk; Thangaraju, K.; Kwon, Soon‐Ki; Kim, Yun‐Hi

doi:10.1039/c3tc00801k

Cited by 54 publications

(14 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1,2 Extensive research has been carried out to promote OLEDs in commercial applications, such as flat-panel displays and solid-state lighting resources, due to their low cost. 3,4 OLEDs have been successfully utilized in mobile phones, computers, car stereos, digital cameras, 5 wrist watches and white solid-state lighting etc. 6,7 The search for new and efficient emitting materials and charge transport layers remains one of the most active areas in this field.…”

Section: Introductionmentioning

confidence: 99%

Design and synthesis of novel anthracene derivatives as n-type emitters for electroluminescent devices: a combined experimental and DFT study

Godumala

Balaiah

Reddy

et al. 2014

Photochem Photobiol Sci

View full text Add to dashboard Cite

Six novel anthracene-oxadiazole derivatives, 4a (2-(4-(anthracen-9-yl)phenyl)-5-p-tolyl-1,3,4-oxadiazole), 4b (2-(4-(anthracen-9-yl)phenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole), 4c (2-(4-(anthracen-9-yl)phenyl)-5-(4-methoxyphenyl)-1,3,4-oxadiazole), 8a (2-(4-(anthracen-9-yl)phenyl)-5-m-tolyl-1,3,4-oxadiazole), 8b (2-(3-(anthracen-9-yl)phenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole) and 8c (2-(3-(anthracen-9-yl)phenyl)-5-(3,4,5-trimethoxyphenyl)-1,3,4-oxadiazole) have been synthesized and characterized for use as emitters in organic light emitting devices (OLEDs). They show good thermal stability (T(d), 297-364 °C) and glass transition temperatures (T(g)) in the range of 82-98 °C, as seen from the thermo gravimetric analysis and differential scanning calorimetric studies. The solvatochromism phenomenon and electrochemical properties have been studied in detail using UV-Vis absorption, fluorescence spectroscopy and cyclic voltammetry. TD-DFT calculations have been carried out to understand the electrochemical and photophysical properties. The spatial structures of 4b and 8c are further confirmed by X-ray diffraction analysis. Un-optimized non-doped electroluminescent devices were fabricated using these anthracene derivatives as emitters with the following device configuration: ITO (120 nm)/α-NPD (30 nm)/4a-4c or 8a-8c(35 nm)/BCP (6 nm)/Alq3 (28 nm)/LiF (1 nm)/Al (150 nm). Among all the six compounds, 8a displays the maximum brightness of 1728 cd m(-2) and current efficiency 0.89 cd A(-1). Furthermore, as an electron transporter, 8a exhibited superior performance (current efficiency is 11.7 cd A(-1)) than the device using standard Alq3 (current efficiency is 8.69 cd A(-1)), demonstrating its high potential for employment in OLEDs. These results indicate that the new anthracene-oxadiazole derivatives could play an important role in the development of OLEDs.

show abstract

Section: Introductionmentioning

confidence: 99%

Design and synthesis of novel anthracene derivatives as n-type emitters for electroluminescent devices: a combined experimental and DFT study

Godumala

Balaiah

Reddy

et al. 2014

Photochem Photobiol Sci

View full text Add to dashboard Cite

show abstract

“…PEDOT:PSS and the layered perovskites are spun on top of ITO, followed by thermal evaporation of TmPyPB and LiF/Al. Energy levels from refs and . (c) SEM cross-section of the device.…”

mentioning

confidence: 99%

Tunable Light-Emitting Diodes Utilizing Quantum-Confined Layered Perovskite Emitters

et al. 2017

View full text Add to dashboard Cite

Organic−inorganic perovskites have been shown to have excellent optoelectronic properties. Further, layered perovskites have been demonstrated, utilizing quantum confinement to achieve emission blueshifted from the bulk band gap. Here, we tune this blue-shift to build LEDs that span the visible spectrum. We demonstrate that electroluminescence from red-shifted layers dominates emission from mixed-thickness devices and that the addition of excess ligand is necessary to drive emission toward blue-shifted layers. By tuning the thickness of the layers, we build LEDs with blue emission utilizing the lead bromide system and orange emission utilizing the lead iodide system. Finally, we demonstrate that these materials suffer reversible degradation under an applied electric field. The spectrally narrow emission, combined with the favorable electronic properties of perovskite materials and access to shorter emission wavelengths through quantum confinement, demonstrates the promise of these materials as a new platform for low-cost, high-performance light-emitting devices.

show abstract

“…The organic molecules that can potentially act as electron-transporting materials should possess sufficiently high electron affinity, greater than 3.0 eV to enable electron injection from the metallic cathode. In recent years, heterocyclic molecules especially those with strongly electron-withdrawing imide units with excellent intramolecular charge transfer (ICT) features have emerged as ETL materials with promising and potential use in the construction of OLEDs [40,[53][54][55].…”

Section: Organic Materials For Led Fabricationmentioning

confidence: 99%

A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

Kagatikar

Sunil

2022

J Mater Sci

View full text Add to dashboard Cite

Organic light-emitting devices (OLEDs) have garnered significant research attention owing to their immense application prospects in leading technologies for full-color flat panel displays and eco-friendly solid-state lighting. They demonstrate exceptional features such as mercury-free construction, wide viewing angle, superior color quality and captivating flexibility. The requirements of light-emitting organic materials pertaining to high stability, lifetime and luminescence quantum yield, combined with the fabrication of devices with high performance efficiency, are highly challenging. Rational molecular design of 1,8-naphthalimide (NI) derivatives can offer quite promising results in achieving standard-light-emitting materials with a wide range of colors for OLED applications. This review is mainly focused on the synthesis and usage of varyingly substituted NI frameworks as luminescent host, dopant, hole-blocking and electron-transporting materials for OLEDs that emit not only red, orange, green and blue colors, but also function as white emitters, which can really have an impact on reducing the energy consumption. The future prospects that could be explored to improve the research in the highly promising field of OLEDs are also discussed. Graphical abstract

show abstract

A new electron transporting material for effective hole-blocking and improved charge balance in highly efficient phosphorescent organic light emitting diodes

Cited by 54 publications

References 49 publications

Design and synthesis of novel anthracene derivatives as n-type emitters for electroluminescent devices: a combined experimental and DFT study

Design and synthesis of novel anthracene derivatives as n-type emitters for electroluminescent devices: a combined experimental and DFT study

Tunable Light-Emitting Diodes Utilizing Quantum-Confined Layered Perovskite Emitters

A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

Contact Info

Product

Resources

About