scholarly journals Peripheral Decoration of Multi-Resonance Molecules as a Versatile Approach for Simultaneous Long-Wavelength and Narrowband Emission

2021 ◽  
Author(s):  
Yanyu Qi ◽  
Weimin Ning ◽  
Yang Zou ◽  
Xiaosong Cao ◽  
Shaolong Gong ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
New Approach ◽  
Light Emitting ◽  
Long Wavelength ◽  
Deep Blue ◽  
Organic Light ◽  
Excellent Color ◽  
High Color Purity

<p>High device efficiency and color-purity are the two essentials for high-quality organic light emitting diodes (OLEDs). Multi-resonance (MR) molecules show great potentials for high color-purity OLEDs due to their sharp emission bands. However, most MR molecules exhibit emission limited from deep-blue to green spectral region. Herein, through peripherally decorating MR emitter with electron donors, we demonstrated a new approach enabling the emission spectra of MR emitters red-shift while retaining narrowband emission. By manipulating the numbers and electron-donating abilities of the peripheries, the first narrowband yellow emitter with emission maxima of 562 nm and a full-width at half-maximum (FWHM) of 30 nm is realized. Highly efficient OLEDs with external quantum efficiency of over 24% and excellent color purity are fabricated by employing these newly developed MR molecules as emitters.</p>

scholarly journals Peripheral Decoration of Multi-Resonance Molecules as a Versatile Approach for Simultaneous Long-Wavelength and Narrowband Emission

2021 ◽  
Author(s):  
Yanyu Qi ◽  
Weimin Ning ◽  
Yang Zou ◽  
Xiaosong Cao ◽  
Shaolong Gong ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
New Approach ◽  
Light Emitting ◽  
Long Wavelength ◽  
Deep Blue ◽  
Organic Light ◽  
Excellent Color ◽  
High Color Purity

<p>High device efficiency and color-purity are the two essentials for high-quality organic light emitting diodes (OLEDs). Multi-resonance (MR) molecules show great potentials for high color-purity OLEDs due to their sharp emission bands. However, most MR molecules exhibit emission limited from deep-blue to green spectral region. Herein, through peripherally decorating MR emitter with electron donors, we demonstrated a new approach enabling the emission spectra of MR emitters red-shift while retaining narrowband emission. By manipulating the numbers and electron-donating abilities of the peripheries, the first narrowband yellow emitter with emission maxima of 562 nm and a full-width at half-maximum (FWHM) of 30 nm is realized. Highly efficient OLEDs with external quantum efficiency of over 24% and excellent color purity are fabricated by employing these newly developed MR molecules as emitters.</p>

Efficient deep-blue organic light-emitting diodes with low driving voltage and high color purity

2021 ◽  
Vol 115 ◽  
pp. 111044
Author(s):  
Kai Chen ◽  
Liang Zhou ◽  
Xuesen Zhao ◽  
Qi Zhu ◽  
Ruixia Wu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Driving Voltage ◽  
Color Purity ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
High Color Purity

High performance red phosphorescent organic electroluminescent devices with characteristic mechanisms by utilizing terbium or gadolinium complexes as sensitizers

2017 ◽  
Vol 5 (8) ◽  
pp. 2066-2073 ◽  
Author(s):  
Rongzhen Cui ◽  
Weiqiang Liu ◽  
Liang Zhou ◽  
Xuesen Zhao ◽  
Yunlong Jiang ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Organic Light ◽  
Gadolinium Complexes ◽  
Organic Electroluminescent ◽  
High Color Purity

High performance sensitized organic light-emitting diodes with high color purity were obtained by utilizing terbium or gadolinium complexes as sensitizers.

Novel Fluoranthene Structure for Deep-Blue Organic Light-Emitting Diodes

2008 ◽  
Vol 8 (9) ◽  
pp. 4787-4792 ◽  
Author(s):  
Soo-Kang Kim ◽  
Jong-Wook Park
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Blue Region ◽  
Deep Blue ◽  
Organic Light ◽  
Color Coordinate ◽  
Excellent Color

As a new fluoranthene derivative, a synthesis of benzo[k]fluoranthene was suggested, so new blue emitting materials, 7,12-diphenylbenzo[k]fluoranthene [DPBF] and 7,8,10-triphenylfluoranthene [TPF] were synthesized. PLmax values of both compounds showed the wavelengths of 458 nm (TPF) and 434 nm, 453 nm (DPBF) that are in blue region. ELmax wavelength of the device using DPBF as an emitting layer was 436 and 454 nm in the deep-blue region, which are similar values with PL. The device that used DPBF as an emitting layer showed high efficiency of 2.11 cd/A and the excellent color coordinate value of (0.161, 0.131) in deep-blue region.

Novel 12,12-Dimethyl-7,12-dihydrobenzo[a]acridine as a Deep-Blue Emitting Chromophore for OLEDs with Narrow-Band Emission and Suppressed Efficiency Roll-Off

2021 ◽  
Author(s):  
Xu Qiu ◽  
Lei Xu ◽  
Shian Ying ◽  
Xiyun Ye ◽  
Pei Xu ◽  
...  
Keyword(s):  
Broad Band ◽  
Organic Light Emitting Diodes ◽  
High Definition ◽  
Light Emitting ◽  
Broad Band Emission ◽  
Band Emission ◽  
Deep Blue ◽  
Organic Light ◽  
Display Technology ◽  
High Color Purity

The fabrication of deep-blue emitting materials with high color purity is crucial for the realization of ultra-high-definition display technology based on organic light-emitting diodes (UHD-OLEDs). However, the intrinsic broad-band emission...

High-Efficiency Red-Fluorescent Organic Light-Emitting Diodes with Excellent Color Purity

2021 ◽  
Vol 125 (3) ◽  
pp. 1980-1989
Author(s):  
Zhiyi Li ◽  
Xiaoxiao Hu ◽  
Guanhao Liu ◽  
Lei Tian ◽  
Honglei Gao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Light Emitting ◽  
Organic Light ◽  
Excellent Color

scholarly journals Solution-Processed Pure Blue Thermally Activated Delayed Fluorescence Emitter Organic Light-Emitting Diodes With Narrowband Emission

2021 ◽  
Vol 9 ◽  
Author(s):  
Ting Xu ◽  
Xiao Liang ◽  
Guohua Xie
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Color Purity ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
High Color Purity

There is a need to satisfy the high color purity requirement of display technology with a simply fabricated process. Herein, solution-processed blue thermally activated delayed fluorescence organic light-emitting diodes (OLEDs) with a narrow spectrum with a full width at half maximum (FWHM) of 32 nm and y color coordinate below 0.2 are demonstrated by employing a molecule containing boron and nitrogen atoms (TBN-TPA) as the guest emitter in the emissive layer. The opposite resonance positions of B-N atoms of TBN-TPA endows a multi-resonance effect, leading to high color purity.

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