Optical and emission properties of terpolymer active materials for white OLEDs (WOLEDs)

Lead halide perovskites are emerging as extremely interesting active materials for a wide variety of optoelectronic and photonic devices. A deep understanding of their photophysics is thus fundamental in order to properly understand the origins of the materials active properties and to provide strategies for improving them. In this work, we exploit the local morphological variations in a drop-cast thin CsPbBr3 nanocrystal film to show that the aggregation of NCs has strong effects on the peak wavelengths of PL spectra, the linewidth, and the intensity of dependence on temperature. An analysis based on models that are frequently used in the literature led to completely different conclusions about the intrinsic NC emission properties extracted from spectra measured in points with different contribution of the PL from the aggregates. Our results demonstrate that extreme care has to be used in order to correctly correlate the spectral PL features with the intrinsic emission properties of lead halide perovskite NC films.

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Active materials and smart structures

AccessScience ◽

10.1036/1097-8542.yb110121 ◽

2015 ◽

Keyword(s):

Smart Structures ◽

Active Materials

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Low Energy Electron Beam Induced Charging and Secondary Electron Emission Properties of FEP Film Used on Satellite Surfaces

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.132.790 ◽

2012 ◽

Vol 132 (9) ◽

pp. 790-796 ◽

Cited By ~ 1

Author(s):

Haruhisa Fujii ◽

Teppei Okumura ◽

Masato Takahashi

Keyword(s):

Electron Beam ◽

Electron Emission ◽

Secondary Electron ◽

Secondary Electron Emission ◽

Low Energy ◽

Energy Electron ◽

Emission Properties ◽

Low Energy Electron

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Red Emission Properties for (Bi$lt;inf$gt;0.5$lt;/inf$gt;Na$lt;inf$gt;0.5$lt;/inf$gt;)TiO$lt;inf$gt;3$lt;/inf$gt;:Sm$lt;sup$gt;3+$lt;/sup$gt; Lead-free Piezoelectrics

Journal of Inorganic Materials ◽

10.15541/jim20130599 ◽

2014 ◽

Vol 29 (8) ◽

pp. 851

Author(s):

SUN Hai-Qin ◽

ZHANG Tao ◽

ZHANG Qi-Wei ◽

ZHANG Yin

Keyword(s):

Lead Free ◽

Red Emission ◽

Emission Properties

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Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

10.26434/chemrxiv.11887026 ◽

2020 ◽

Author(s):

Pengbo Han ◽

Zeng Xu ◽

Chengwei Lin ◽

Dongge Ma ◽

Anjun Qin ◽

...

Keyword(s):

High Performance ◽

General Strategy ◽

Flat Panel Displays ◽

Light Emitting ◽

Horizontal Orientation ◽

Deep Blue ◽

Full Color ◽

High Emission ◽

White Oleds ◽

Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIEx,y = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A-1, 60.7 lm W-1 and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

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