High fluorescence efficiency of dual-wavelength white OLED with NPB emission and triplet annihilation

Yang, Su–Hua; Huang, Tao-Liang

doi:10.1016/j.optmat.2020.110725

Cited by 13 publications

(10 citation statements)

References 53 publications

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“…Each EL spectrum matched well with its corresponding PL spectrum in thin films (Fig. 2(b)) without any additional peaks at low wavelengths from all buffer layers (NPB at 440 nm, 27 TCTA at ∼400 nm, 28 and TPBi at ∼380 nm), 29 indicating good balance of the charge transport in these devices. Moreover, upon varying the driving voltage from 7 V to 14 V, the shape and position of EL spectra of all devices were almost unchanged even at high voltages (Fig.…”

Section: Resultssupporting

confidence: 68%

Rational molecular design of phenanthroimidazole–azine derivatives for efficient non-doped blue organic light-emitting diodes with low-efficiency roll-off

Chasing,

Kumsampao,

Janthakit

et al. 2023

J. Mater. Chem. C

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Section: Resultssupporting

confidence: 68%

Rational molecular design of phenanthroimidazole–azine derivatives for efficient non-doped blue organic light-emitting diodes with low-efficiency roll-off

Chasing,

Kumsampao,

Janthakit

et al. 2023

J. Mater. Chem. C

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“…In this context, construction of large number of NI derivatives that have been investigated to achieve wide color-range is reported by various pioneers. Moreover, as white light-emitting OLEDs (WOLEDs) have created substantial performance advances to the general lighting [92][93][94][95], attributed to their significant environmental and energy saving benefits, few reports on NI grafted polymers for WOLED applications are also documented. The following sections illustrate the fabrication of OLEDs using different NI derivatives as ETL, in view of achieving optimum optical, electrochemical and thermal properties.…”

Section: 8-naphthalimide As An Electrontransporting Luminescent Materialsmentioning

confidence: 99%

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

Kagatikar

Sunil

2022

J Mater Sci

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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

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“…The low V on of 2.6 V (Figure 4c) was attributed to the optimized injection of both the holes and the electrons. [33,34] Figure 1d depicts the mechanism of the micro-cavity effect and the LSPR in the device. They play an essential role in enhancing the light output-coupling of the OLED.…”

Section: Characterizations Of the Teoledsmentioning

confidence: 99%

Enhancing the Light Output‐Coupling of Inverted Top‐Emitting Organic Light‐Emitting Diodes by Using the Localized Surface Plasmon Resonance of Ag Nanoparticles

Zhao

Niu

Shi

et al. 2022

Adv Materials Inter

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maximum (FWHM) and current efficiency (CE) of the TEOLEDs are significantly optimized owing to the micro-cavity effect of the top-emitting structure, promoting the applications in ultra-high-definition displays and micro-displays. [11,12] However, one major challenge of the TEOLEDs is the severe waveguide and plasmonic losses, which hinders the light outputcoupling and results in the low external quantum efficiency (EQE). [13,14] Introducing the localized surface plasmon resonance (LSPR) in the device is an effective way to increase the EQE of the OLEDs. [15,16] The LSPR is generated by overlapping the local electromagnetic field of excitons in the emitting layer and the surface plasmons of the noble metal in form of the nanowire and nanoparticles (NPs). [17][18][19][20][21] When the absorption peak of the metal NPs matches the emission wavelength of the device, the local electromagnetic fields around the NPs at a specific wavelength are enhanced. [22,23] More importantly, the LSPR is greatly influenced by the size of the noble metal NPs. [24,25] By precisely adjusting the size and the spacing of the NPs, the resonance wavelength of the NPs can be tuned to well match the wavelength of the electroluminescence (EL) spectra of OLEDs. [26,27] However, there are few reports on the effect of the LSPR on the inverted TEOLEDs.In this study, we have introduced a light output-coupling layer (LOCL) composed of AgNPs and MoO x on the top capping layer (CPL) of the inverted TEOLED device. The AgNPs in the LOCL could significantly improve the light output-coupling of the TEOLED owing to the LSPR, and the MoO x in the LOCL could effectively protect the water-and oxygen-sensitive electron injection material. In addition, the FWHM is narrowed to 50 nm due to the micro-cavity effect of the top-emitting structure and the turn-on voltage (V on , calculated at the lowest brightness of ≈1 cd m −2 ) is decreased to 2.6 V with Ag 2 O doped 4,7-diphenyl-1,10-phenanthroline (Bphen) as electron injection layer (EIL). Through systematical analysis and the finite difference time domain simulation (FDTD), we found that when the thickness of the AgNPs was 0.5 nm and the thickness of MoO x was 20 nm, the light output-coupling of the device reached the best. The CE and the EQE were increased 1.53 and 1.3 times to 28.3 cd A −1 and 13.11%, and the luminance achieves 34 247 cd m −2 .In this study, a light out-coupling layer (LOCL) composed of Ag nanoparticles (NPs) and MoO x is introduced on top of the inverted top-emitting organic light-emitting diode (OLED). The full width at half maximum (FWHM) is narrowed to 50 nm due to the micro-cavity effect of the top-emitting structure and the turn-on voltage is as low as 2.6 V. The AgNPs in the LOCL significantly improves the light output-coupling of the OLED owing to the localized surface plasmon resonance, and the MoO x in the LOCL effectively protects the water-and oxygen-sensitive electron injection material. As a result, the performance of the OLED with the LOCL is significantly enhanced. The maximum...

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High fluorescence efficiency of dual-wavelength white OLED with NPB emission and triplet annihilation

Cited by 13 publications

References 53 publications

Rational molecular design of phenanthroimidazole–azine derivatives for efficient non-doped blue organic light-emitting diodes with low-efficiency roll-off

Rational molecular design of phenanthroimidazole–azine derivatives for efficient non-doped blue organic light-emitting diodes with low-efficiency roll-off

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

Enhancing the Light Output‐Coupling of Inverted Top‐Emitting Organic Light‐Emitting Diodes by Using the Localized Surface Plasmon Resonance of Ag Nanoparticles

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