Photonics

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Photonics
Name of speaker Prof.Alexei Vitukhnovsky
Head, Vavilov Luminescence
Department P.N. Lebedev Physical
Institute Russian Academy of Sciences
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Agenda / content

• Description of the organisation/company
• Research activities of the organisation/company
• Research activities where co-operation is sought

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1. Description of the organisation/ company

• The P.N. Lebedev Physical Institute (LPI) of the
  Russian Academy of Sciences is known as oldest
  and one of first-rate physical institutes of
  Russia. LPI fulfils basic researches in
  theoretical physics, nuclear physics
  astrophysics, quantum radiophysics, solid-state
  physics, optics and photonics.
• Six of LPIs scientists are Nobel Prize winners
  in physics, and A.Sakharov the inventor of
  thermonuclear bomb was awarded seventh for the
  Peace. There are about 2000 employees in staff
  now, 900 of them researchers including 185
  Doctors of Sciences (Full Professors) and 430
  Ph.D.

H-bomb
lasers
superconductivity
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2. Research activities of the Lebedev Physical
Institute

• The research activities in the field of
  Photonics
• studies in general optics and photonics,
  luminescence, coherent and nonlinear optics,
  holography,
• new types of lasers, interaction of laser
  radiation with matter, laser location of space
  objects, high-precision methods of laser
  spectroscopy, laser standards of frequency,
• space research in wide spectral range (from
  infrared to X-ray), photoelectric phenomena and
  photodetectors,
• electro optics, light beam modulation and
  scanning, optoelectronics devices and systems,
• optical information protection, store, and
  processing in real time,
• image analysis, recognition and identification,
• display materials and developments.

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3. Research activities where co-operation is
sought

• OLEDs based on organic-inorganic nanomaterials
• Quantum Dots (QD) OLEDs
• OLEDs based on metaloorganic complexes
  prototype construction
• OLED degradation processes study
• Investigation CdTe/CdSe nanotetrapods and their
  application for FET, OLED and PV-cells
• Metal (Au, Ag) - J-aggregate QDs
• Investigation QDs blinking as key-problem for
  QD-OLEDs application.
• Study of relaxation processes in QDs under
  fs-laser excitation

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Motivation of Quantum Dots application
QD-Up-Con
QD-PV-cell
QD-OLED
Colloidal quantum dots (QDs) in different
matrixes are extremely attractive for
application QD- Organic Light Emitting Diodes
QD-Photovoltaic cells (solar cells)
QD-converter blue light to red one-
(up-conversion)
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Optical Properties of core-shell Quantum Dots
Metal-dielectric
Semiconductor-semiconductor
Quantum Dots CdTe, covered by CdSeE
Au,Ag Quantum Dots, covered by J-aggregates
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Metalic Quantum Dot
J -aggregate
Surface Plasmon
Ag, Au
TC
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Core-shell QD
J-aggregate
Au, Ag
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???????????? (???. Tetrapoda) ??? ????????
??????????? ????????, ???????????? ????
???????? ????????????? ???????????.
???????????? ?????? (Agalychnis callidryas)
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Nanotetrapod
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CdTe (naked)QDs image from LEO912 AB OMEGA
Transmission Electron Microscope
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CdTe/CdSe (dressed) QDs TEM image Shell
growing on the pods end mainly
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Why blinking?.

• Blinking of QDs in matrixes is interesting
  phenomenon of an irregular light emitting under
  CW laser excitation to absorption band of QDs.
• The nature of blinking is key to understanding QD
  internal electron processes needed for effective
  QDs application

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Probability density of the off-state intervals
distribution
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Experimental data were approximated with the
power function with an exponent of -1.67
Sphere CdSe/ZnS
Tetrapod CdTe/CdSe

-1.67
-1.60
Abstract to 1-st International NanoForum, Moscow,
Dec.3-5,2008
Phys. Rev. B, 63, 205316 (2001).
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Ideas
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Prof.Johansson, Sweden
Prof.Van der Auweraer, Belgium
Prof.Silbey, USA
Moscow
Prof.Lvov,USA
Prof.Argyrakis, Greece
Prof.Yonezawa Japan
Prof.Talapatra, India
NB!
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Thank you

• Contact details Prof.Alexei Vitukhnovsky
• E-mail alexei_at_sci.lebedev.ru
• 53, Leninsky pr., Moscow119991 RUSSIA
• Phone [phone]