Alternating-Current Light-Emitting Diodes and their Transient Characteristics: Response Time and Carrier Transport

1997 ◽  
Vol 488 ◽  
Author(s):  
A. J. Pal ◽  
T. öStergÅrd ◽  
R. österbacka ◽  
K-M. KÄllman ◽  
H. Stubb
Keyword(s):  
Carrier Transport ◽  
Light Emitting Diodes ◽  
Response Times ◽  
Alternating Current ◽  
Film Deposition ◽  
Blodgett Film ◽  
Light Emitting ◽  
Langmuir Blodgett ◽  
Electroluminescence Intensity

AbstractWe report the fabrication and characterization of alternating current light-emitting diodes (LEDs) with quinquethiophene as the emitting material. We have obtained equal electroluminescence intensity in both bias sections. From the frequency response of the LEDs, we have estimated the device response times and compared them with the response times obtained from the transient response of dc LEDs. Langmuir-Blodgett film deposition technique has been employed to control the thickness of the emitting layer on the molecular scale. We have shown that the response times originate from the accumulation rather than the transit of charge carriers. We have compared the photo- and electroluminescence spectra of QT LEDs.

Characterization of Asymmetric Polydiacetylene Ultrathin Films

1995 ◽  
Vol 382 ◽  
Author(s):  
D. W. Cheong ◽  
V. Shivshankar ◽  
H. C. Wang ◽  
C. M. Sung ◽  
J. Kumar ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Second Harmonic ◽  
Film Deposition ◽  
Asymmetric Structure ◽  
Blodgett Film ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Ft Ir

ABSTRACTNonlinear optical (NLO) ultrathin films of a preforrned asymmetric polydiacetylene have been fabricated by Z-type Langmuir-Blodgett film deposition from the air-water interface. Induced in-plane orientation of the polydiacetylene backbone on the substrates has been confirmed by UV/Vis, FT-IR dichroism, and degenerate four wave mixing (DFWM) studies. All the measurements indicate that the backbone is prefe rentially oriented along the dipping direction. Second harmonic generation study suggests that the LB multilayers form an asymmetric structure (Z-type) due to the accumulation of 2-dimensional ordered monolayer and the dominant induced second order polarization is in the plane of the film. The film morphology and molecular orientation have been investigated by atomic force microscopy (AFM).

Dual-Emitting Langmuir−Blodgett Film-Based Organic Light-Emitting Diodes

Langmuir ◽  
2010 ◽  
Vol 26 (13) ◽  
pp. 11461-11468 ◽  
Author(s):  
Henk J. Bolink ◽  
Etienne Baranoff ◽  
Miguel Clemente-León ◽  
Eugenio Coronado ◽  
Nora Lardiés ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Blodgett Film ◽  
Light Emitting ◽  
Langmuir Blodgett ◽  
Organic Light ◽  
Langmuir Blodgett Film

Fabrication and Characterization of Blue Organic Light-emitting Diodes

2011 ◽  
Author(s):  
Merric Srour ◽  
Richard Fu ◽  
Steven Blomquist ◽  
Jianmin Shi ◽  
Eric Forsythe ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Fabrication And Characterization

Alternating current electroluminescence from GaN-based nanorod light-emitting diodes

2021 ◽  
Vol 140 ◽  
pp. 107044
Author(s):  
Kun Wang ◽  
Peiqi Chen ◽  
Jingjing Chen ◽  
Ye Liu ◽  
Chaoxing Wu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Alternating Current ◽  
Light Emitting

Response times of light-emitting diodes

1972 ◽  
Vol 19 (8) ◽  
pp. 995-997 ◽  
Author(s):  
S. Nakamura ◽  
J. Umeda ◽  
O. Nakada
Keyword(s):  
Light Emitting Diodes ◽  
Response Times ◽  
Light Emitting

Electrical characterization of organic light-emitting diodes using dipotassium phthalate as n-type dopant

2008 ◽  
Vol 93 (8) ◽  
pp. 083505 ◽  
Author(s):  
Meng-Huan Ho ◽  
Ming-Ta Hsieh ◽  
Teng-Ming Chen ◽  
Jenn-Fang Chen ◽  
Shiao-Wen Hwang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Electrical Characterization ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light
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