Hydroxyphenyl-pyridine Beryllium Complex (Bepp2) as a Blue Electroluminescent Material

2000 ◽  
Vol 12 (9) ◽  
pp. 2672-2675 ◽  
Author(s):  
Yanqin Li ◽  
Yu Liu ◽  
Weiming Bu ◽  
Dan Lu ◽  
Ying Wu ◽  
...  
Keyword(s):  
Blue Electroluminescent Material

Dibenzothiophene-5,5-dioxide-containing PPV based copolymer as green–blue electroluminescent material

2003 ◽  
Vol 132 (2) ◽  
pp. 191-195 ◽  
Author(s):  
Bao-Hu Wang ◽  
Jie Yin ◽  
Min Zhao Xue ◽  
Ju lin Wang ◽  
Gaoyu Zhong ◽  
...  
Keyword(s):  
Blue Electroluminescent Material

Atomic Force Microscopy and X-Ray Photoelectron Spectroscopy Study on the Surface and Interface States of Liq and ITO Films

2010 ◽  
Vol 152-153 ◽  
pp. 566-571
Author(s):  
Jian Feng Li ◽  
Qing Song ◽  
Wei Bing Shi ◽  
Fu Jia Zhang
Keyword(s):  
Atomic Force Microscopy ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Interface States ◽  
Xps Spectra ◽  
X Ray ◽  
Force Microscopy ◽  
Surface And Interface ◽  
Atomic Force ◽  
Blue Electroluminescent Material

An understanding of the surface and interface states of the organic material and the underlying andoe material is meaningful for organic light-emitting devices (OLEDs). The 8-Hydroxyquinolinolatolithium (Liq) was deposited on indium-tin-oxide (ITO) coated glass by traditional vacuum evaporation.The thickness of Liq is about 120nm. The morphology, surface and interface electron states of the Liq and the underlying ITO have been investigated with the utilization of the atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) technology. AFM observation indicated that Liq grows in the shape of an asymmetrically-distributed island, with each island resembling a round hillock and different size. The Liq film is not very uniform and teemed with many pinholes and cracks.The analysis on XPS spectra of the surface of the Liq/ITO samples shows that, the core-levels of Li1s, C1s, N1s, O1s, In3d5/2, and Sn3d5/2, spectra slightly shift towards lower binding energy with the increase of the sputtering time, which may be caused by the effect of oxygen, indium and tin in ITO diffusing into Liq layer and the argon ions beam with energy. Coordination bond between Li atoms and N atoms does not exist in Liq, which is the main reason why Liq is the blue electroluminescent material. The C atoms mainly bond to C, N and O atoms, forming C-C, C-N=C and C-O bonds, respectively. And there is a speculation of the existence of contaminated C atoms in the surface of ITO, while the O atoms basically originate from quinolate rings and the absorption of O2 and H2O. At the interface N and O, In and Sn interact to some extent, which probably affects the emitting colour of Liq based OLEDs. The analysis of surface of In3d and Sn3d spectrum by XPS provides additional evidence of the existence of cracks and pinholes in Liq layer, leading to much absorption of air molecules.

Elucidation of the Structure of a Highly Efficient Blue Electroluminescent Material

2003 ◽  
Vol 125 (4) ◽  
pp. 880-881 ◽  
Author(s):  
Annie J. Middleton ◽  
William J. Marshall ◽  
Nora S. Radu
Keyword(s):  
Highly Efficient ◽  
Blue Electroluminescent Material

Y-Shaped Donor-π-Acceptor Based Deep-Blue Electroluminescent Material for Undoped Organic Light Emitting Devices

2021 ◽  
pp. 118088
Author(s):  
Amjad Islam ◽  
Khurram Usman ◽  
Qari Muhammad Kaleem ◽  
Abdul Ghafar Wattoo ◽  
Kashif Javaid ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Deep Blue ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
Blue Electroluminescent Material
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