意大利Frascati研究中心Giuseppe Baldacchini教授12月16日下午学术报告

发布时间:2012-12-13访问量:52设置

报告人:Giuseppe Baldacchini 教授

 

Via G. Quattrucci 246

00046 Grottaferrata, Roma, ITALY

Tel: +39-06-9410068 (mob. 333-6473768)

E-mail: giuseppe.baldacchini@gmail.com

 

题目:The singular optical properties of Alq3 molecules and consequences on OLEDs

 

时间:20121216日(星期日)下午4:00

地点:910-208

 

摘要:

Organic light emitting devices, OLEDs, have been so much improved in the last two decades that they are being currently used in commercial applications for displays and lighting. Among many improving technologies, annealing processes affect greatly their performances, especially when the active material is the small molecule Alq3. However, it was never understood why and how the temperature treatments could have played such an important role, until recently we have discovered that such molecules tend to aggregate themselves in morphological states different from the well known crystalline phases. Annealing processes produce a phase transition among the previous aggregations, which improves the emission efficiency and the lifetime of Alq3 thin films. Moreover, these aggregations are fully described by a four components model, FCM, which has been validated by degradation experiments lasting 50,000 h, almost 6 yr, a world record in its own.

Moreover, it has been found that above 30,000 h the photoluminescence of thin films in the atmosphere decays faster than an exponential behavior, so that a zero order term has been added to the well known first order one in the decay equation. Preliminary simulations of experimental data have shown that the environmental conditions play a non secondary role in this zero order approach.

In addition, although the previous studies refer uniquely to the luminescent molecule Alq3, recent results by other authors seem to indicate that a general trend exists in organic luminescent compounds due to their molecular coordination, a matter of some importance for the properties of the emitting material in particular and OLEDs in general.

 

 

个人简历:

Biographical informations:

born in Narni, Terni, Italy, December 15, 1941

married with three children

 

EDUCATION:

Degree in Physics from the University of Rome in 1965

 

HONORS/AWARDS/FELLOWSHIPS:

Fellow, Italian Physical Society

Fellow, European Physical Society

Fellow, Coblentz Society

Fellow, Electrochemical Society

Award “Sergio Panizza” for outstanding contributions in Physics, SIF, 1993

Fellowship Consiglio Nazionale delle Ricerche, CNR, 1966

Fellowship CNR and Berkeley Physics Department, 1971, 1972

Fellowship ZWO, Netherlands, CatholicUniversity of Nijmegen, 1982

 

CAREER/EMPLOYEMENT:

1965-1975       Assistant, Physics Department, University of Rome

1967-1994       Scientist ENEA (former CNEN), FrascatiResearchCenter

1972                Assistant Research, Physics Department, University of California, Berkeley

1976-1977       Research Associate, Physics Department, University of Utah, Salt Lake City.

1984-1986       Adjunct Professor, Chemistry Department, University of Venice

1987                Visiting Prof., Physics Department, Pontifical Catholic University of Rio de Janeiro.

1989                Visiting Professor, Institute of Physics, JagellonianUniversity, Krakow, Poland

1994-2008       Scientist, Head of Laser and Accelerators Division, ENEA, FrascatiResearchCenter

 

RESEARCH INTERESTS/PUBLICATIONS

Research spanned in times from EPR and NMR to cryogenics, color centers in alkali halides, optoelectronics, laser materials, and high resolution molecular spectroscopy. More recently, interests focused also on luminescent phenomena in insulating crystals and organic materials. Particular emphasis has been devoted to radiative and nonradiative processes which play a fundamental role in the optical absorption-emission cycle of matter. In the previous research fields, 270 papers have been published in refereed journals, 100 papers in technical reports, and 300 communications, of which 50 invited have been presented at scientific meetings. About 100 seminars have been delivered, 1 international conference chaired and other ones co-organized, among them 20 schools on spectroscopy at the International Ettore MajoranaCenter in Erice.

 

RECENT SELECTED PUBLICATIONS:

 

(1)               G. Baldacchini, T. Baldacchini, A. Pace, and R.B. Pode, Emission Intensity and Degradation Processes of Alq3 Films, Electrochem. SolidState Lett. 8, J24-J26 (2005).

(2)               G. Baldacchini, A.T. Davidson, V.S. Kalinov, A.G. Kozakiewicz, R.M. Montereali, E. Nichelatti, and A.P. Voitovich,Thermoluminescence of Pure LiF Crystals and Color Centers,J. Lumin. 122-123 (2007) 371-373.

(3)               G. Baldacchini, T. Baldacchini, P. Chiacchiaretta, A. Pace, and R.B. Pode,Photoluminescence and Morphology of Alq3 Films and Four-Components Model, J. Electrochem. Soc. 154, J217-J225 (2007).

(4)               G. Baldacchini,  P. Di Lazzaro, D. Murra, G. Fanti,Coloring Linens by Excimer Laser to Simulate the Body Image of the Turin Shroud, Appl. Opt. 47, 1278 (2008).

(5)               G. Baldacchini, T. Baldacchini, P. Chiacchiaretta, R.B. Pode, and Q.-M. Wang,Morphological phase transitions in Alq3 films,J. Lumin. 129 (2009) 1831-1834.

(6)               G. Baldacchini, P. Chiacchiaretta, R. Reisfeld, and E. Zigansky,The origin of luminescence blue shift in Alq3 composites,J. Lumin. 129 (2009) 1849-1852. 

(7)               P. Di Lazzaro, D. Murra, A. Santoni, G. Fanti, E. Nicolatti,and G. Baldacchini, Deep Ultraviolet Radiation Simulates the Turin Shroud Image, Journal of Imaging Science and Technology,  54, Issue 4, 040302-6, (2010).

(8)               A. P. Voitovich, V. Kalinov, G.E. Malashkevich, L.P. Runets, A.P. Stupak, R.M. Montereali, and G. Baldacchini, Luminescent Probe to Investigate Material Absolute Absorptions, Opt. Mater. 33, 490-493 (2011).

(9)               N. Akiyama, T. Shirosaki, S. Muramatsu, and G. Baldacchini, Vibronic Relaxation Processes of the FA Center in RbCl:Li, J. Lumin. 132 (2012) 1649-1655.

(10)           G. Baldacchini, P. Chiacchiaretta, R.B. Pode, M.A. Vincenti, and Q.-M. Wang,Phase Transitions in Thermally Annealed Films of Alq3, Low Temperature Physics/Fizika Nizkikh Temperatur, 2012, v. 38, N. 8, pp. 985-992. 

(11)             G. Baldacchini and F. Baldacchini, Image Formation of the Turin Shroud: Hypothesis Based on Water Vapor Effects of Light Absorption, Sci. Res. Essays 7(29)pp. 2591-2602, 30 July, 2012.

 

 

SELECTED PUBLICATIONS EVER:

 

1.      G. Baldacchini and V. Montelatici, A Contribution to the Study of Dynamic Polarization by Solid Effect, Nuovo Cimento, 68B, 253 (1970).

2.      L. F. Mollenauer and G. Baldacchini,Empirically Determined Wave Function for the Relaxed-Excited State of the F Center in KI, Phys. Rev. Letters, 29, 465 (1972).

3.      P. Cardoni and G. Baldacchini, A New and Simple Coupling Device for Transfer Tubes, Cryogenics 15, 151 (1975).

4.      G. Baldacchini, U.M. Grassano, and A. Tanga, Electron-Spin Memory and Magnetic Circular Dichroic Effects in the Luminescence of F Center in KI, KBr and KCl, Phys. Rev. B20, 4357 (1979).

5.      G. Baldacchini, D.S. Pan, and F. Luty, Radiative and Nonradiative Processes of F and F' Centers in NaBr and NaI, Phys. Rev. B 24, 2174 (1981).

6.      G. Baldacchini, S. Marchetti, V. Montelatici, G. Buffa, and O. Tarrini, Experimental and Theoretical Investigation of Self-Broadening and Self-Shifting of Ammonia Transition Lines in the n2 Band, J. Chem. Phys. 76, 5271 (1982).

7.      G. Baldacchini and U.M. Grassano, Mesurement of the Electron-Spin Polarization in the Relaxed Excited State of the F Center, Phys. Rev. B28, 4855 (1983).

8.      G. Baldacchini, E. Giovenale, F. De Matteis, A. Scacco, F. Somma, M. Casalboni, and U.M. Grassano, New Luminescence of the FA Centre in RbCl:Li+, Europhys. Lett. 7, 647 (1988).

9.      G. Baldacchini, S. Botti, U.M. Grassano, L. Gomes, and F. Luty, Optical and Thermal Bistability of Two FH(OH-) Center Configurations in KBr and KI, Europhys. Lett. 9, 735 (1989).

10.  R.M. Montereali, G. Baldacchini, and L.C. Scavarda Do Carmo, LiF Films: Absorption and Luminescence of Colour Centres, Thin Solid Films, 205,106 (1991).

11.  G. Baldacchini, G. Buffa, F. D’Amato, F. Pelagalli, and O. Tarrini: Variations in the Sign of the Pressure-Induced Lineshifts in the n2 Band of Ammonia with Temperature, J. Quant. Spectrosc. Radiat. Transfer, 55, 741 (1996).

12.  G. Baldacchini, M. Cremona. G. d’Auria, R.M. Montereali, and V. Kalinov: Radiative and Nonradiative Processes in the Optical Cycle of the F3+ Center in LiF, Phys. Rev. B54, 17508 (1996).

13.  G. Baldacchini, Colored LiF: an Optical Material  for all Seasons, J. Lumin.100, 333-343 (2002).

14.  G. Baldacchini, F. Bonfigli, F. Flora, R. M. Montereali, D. Murra, E. Nichelatti, A. Faenov,  and T. Pikuz,High Contrast Photoluminescent Patterns in Lithium Fluoride Crystals Produced by Soft X-Rays from a Laser-Plasma Source, Appl. Phys. Lett. 80, 4810-4812 (2002).

15.  G. Baldacchini, T. Baldacchini, S. Gagliardi, R.M. Montereali, A. Pace, and R.B. Pode, Photoluminescence of Alq3 Stabilized by a Phenolic Compound, Electrochem. and SolidState Lett. 5, H14-H15 (2002).

16.  G. Baldacchini, A.T. Davidson, V.S. Kalinov, A.G. Kozakiewicz, T. Marolo, M. Montecchi, R.M. Montereali, E. Nichelatti, and A.P. Voitovich, Spectroscopic Measurements and Thermoluminescence of γ-ray colored LiF Crystals, Optical Materials, 24, 129-135 (2003).

17.  G. Baldacchini, F. Bonfigli, A. Faenov, F. Flora, R.M. Montereali, A. Pace, T. Pikuz, andL. Reale,Lithium Fluoride as a Novel X-Ray Image Detector for Biological μ-World Capture, J. Nanosci. Nanotech. 3, 483-486 (2003).

18.  G. Baldacchini, T. Baldacchini, A. Pace, and R.B. Pode, Effects of Chemical and Physical Agents on the Emission Properties of Alq3 Films, J. Electrochem. Soc. 151, H11-H15 (2004).

19.  G. Baldacchini, et al.  Soft x-ray submicron imaging detector based on point defects in LiF, Rev. Sci. Instrum. 76, 113104-12 (2005). This work has been selected for the December 1, 2005 issue of Virtual Journal of Biological Physics Research.



 

 

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