Improving the Crystallization Resistance of Aluminum(III) 8-Hydroxyquinoline-Based Emitting Materials by Entropic Stabilization

1999 ◽  
Vol 561 ◽  
Author(s):  
Keith A. Higginson ◽  
Baocheng Yang ◽  
Fotios Papadimitrakopoulos
Keyword(s):  
Phase Separation ◽  
Light Emitting Diodes ◽  
Thermally Stable ◽  
Morphological Stability ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Show Evidence ◽  
Entropic Stabilization

ABSTRACTThe morphological stability of evaporated films of aluminum(III) 8-hydroxyquinoline (Alq3) was investigated. Films which were found to be non-crystalline by x-ray diffraction upon deposition, crystallized rapidly upon annealing, especially where defects were present. Blends of Alq3with aluminum(III) 5-methyl-8-hydroxyquinoline were proposed for thermally stable amorphous emitting layers in light-emitting diodes. Films coevaporated at a 1:1 ratio did not show evidence of crystallization or phase separation even after long annealing periods at temperatures as high as 160°C.

scholarly journals The Role of Bismuth on the Best Red Light Emitting Nanophosphors

2021 ◽  
Vol 9 (6) ◽  
pp. 55-59
Author(s):  
Vini. K ◽  
Padmakumar H. ◽  
K.M. Nissamudeen
Keyword(s):  
Rare Earths ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Combustion Method ◽  
Processing Temperature ◽  
X Ray Diffraction ◽  
Luminescence Enhancement ◽  
Light Emitting ◽  
X Ray

This paper explains the role of bismuth in the luminescence enhancement of Y2O3 :Eu nanophosphors prepared by Combustion method. Bi ions serve as effective sensitizers for visible emitting rare earths for Light Emitting Diodes. From the X-ray diffraction studies, bismuth co-activated nanophosphors exhibit an early crystallization. Bismuth incorporation not only results in the luminescence enhancement at 612 nm, due to 5D0 to 7F2 transition but also reduces the processing temperature for intense photoemission.

Nanofocus x-ray diffraction and cathodoluminescence investigations into individual core–shell (In,Ga)N/GaN rod light-emitting diodes

2016 ◽  
Vol 27 (32) ◽  
pp. 325707 ◽  
Author(s):  
Thilo Krause ◽  
Michael Hanke ◽  
Zongzhe Cheng ◽  
Michael Niehle ◽  
Achim Trampert ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Individual Core

Photocrystallography – design and methodology for the use of a light-emitting diode device

2010 ◽  
Vol 43 (2) ◽  
pp. 337-340 ◽  
Author(s):  
Simon K. Brayshaw ◽  
Jason W. Knight ◽  
Paul R. Raithby ◽  
Teresa L. Savarese ◽  
Stefanie Schiffers ◽  
...  
Keyword(s):  
Single Crystal ◽  
Light Source ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Experimental Methodology ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Led Array

With the increase in interest in photocrystallographic experiments, the use of light-emitting diodes (LEDs) provides an alternative, low-budget light source (by comparison to lasers) and allows photocrystallographic experiments to be carried out readily. Here the design of an LED array device suitable for use in single-crystal X-ray diffraction experiments is reported, and the experimental methodology used for determining the structures of metastable species is described.

Cation distributions and possible phase separation inTl2Ba2CuO6+δfrom synchrotron powder x-ray diffraction

1995 ◽  
Vol 51 (18) ◽  
pp. 12747-12753 ◽  
Author(s):  
M. A. G. Aranda ◽  
D. C. Sinclair ◽  
J. P. Attfield ◽  
A. P. Mackenzie
Keyword(s):  
Phase Separation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cation Distributions

scholarly journals ToF-SIMS imaging of the nanoscale phase separation in polymeric light emitting diodes: Effect of nanostructure on device efficiency

The Analyst ◽  
2011 ◽  
Vol 136 (4) ◽  
pp. 716-723 ◽  
Author(s):  
Bang-Ying Yu ◽  
Che-Hung Kuo ◽  
Wei-Ben Wang ◽  
Guo-Ji Yen ◽  
Shin-ichi Iida ◽  
...  
Keyword(s):  
Phase Separation ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Nanoscale Phase Separation ◽  
Tof Sims ◽  
Device Efficiency

Thermally Stable, Dye-Bridged Nanohybrid-Based White Light-Emitting Diodes

2011 ◽  
Vol 23 (48) ◽  
pp. 5767-5772 ◽  
Author(s):  
Seung-Yeon Kwak ◽  
SeungCheol Yang ◽  
Na Ree Kim ◽  
Jae Hong Kim ◽  
Byeong-Soo Bae
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Thermally Stable ◽  
Light Emitting ◽  
White Light Emitting Diodes
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