Organic Optoelectronic Materials & Devices Laboratory                                                                        

 

PUBLICATIONS
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2008

· Y. Lou, H. Aziz, G. Xu, Z. Popovic, and G. Xu “Effect of exciton diffusion on electroluminescence of organic light emitting devices”, Organic Electronics 9, 1128 (2008).

· R.A. Klenkler, H. Aziz, A. Tran, Z. Popovic, and G. Xu “High electron mobility triazine for lower driving voltage and higher efficiency organic light emitting devices”, Organic Electronics 9, 285 (2008).

· Y.C. Luo, H. Aziz, R. Klenkler, G. Xu, and Z. Popovic, “Temperature dependence of photoluminescence efficiency in doped and blended organic thin films” Chemical Physics Letters 458, 319 (2008).

· T. Sadek, H. Aziz, R.O.  Loutfy, R.O. and P.M. Smith, P.M, “Poor confinement of e-h recombination zone in blue OLEDs” Proceedings of the IEEE Canadian Conference on Electrical and Computer Engineering, Niagara Falls, Ontario, May 2008, Pp 1117-1120 (2008).

2007

· Y.C. Luo, H. Aziz, Z.D. Popovic and G. Xu, “Electron induced quenching of excitons in luminescent materials ”, Chem. Mat. 19, 2288 (2007). 

· Y.C. Luo, H. Aziz, G. Xu, and Z.D. Popovic “Similar roles of electrons and holes in the degradation of organic light-emitting devices”, Chem. Mat. 19, 2079 (2007). 

· Y.C. Luo, H. Aziz, Z.D. Popovic and G. Xu, “Improving the stability of organic light-emitting devices by using a hole-injection-tunable-anode-buffer-layer” J. Appl. Phys. 101, 054512 (2007).

· Y.C. Luo, H. Aziz, Z.D. Popovic and G. Xu, “Degradation mechanisms in organic light-emitting devices: metal migration model versus unstable tris(8-hydroxyquinoline) aluminum cationic model” J. Appl. Phys. 101, 034510 (2007).

2006

· H. Aziz, Y. Luo, G. Xu, Z.D. Popovic, “Improving the Stability of Organic Light-Emitting Devices by Using a Thin Mg Anode Buffer Layer”  Applied Physics Letters 89, 103515 (2006).

· Y. Luo, H. Aziz, Z.D. Popovic, G. Xu, “Electric-field-induced Fluorescence Quenching in Dye-doped Tris(8-hydroxyquinoline) Aluminum Layers” Applied Physics Letters 89, 103505 (2006).

· R. Klenkler, G. Xu, H. Aziz, Z.D. Popovic “Charge-carrier Mobility in an Organic Semiconductor Thin Film Measured by Photoinduced Electroluminescence” Applied Physics Letters 88, 242101 (2006).

· Y. Luo, H. Aziz,  G. Xu, and Z. D. Popovic “Effect of Driving Mode on Electroluminescence Efficiency and Stability of Organic Light-Emitting Devices” Journal of Applied  Physics 99, 054508 (2006).

· Y.C. Luo, H. Aziz, Z.D. Popovic and G. Xu, “Electric field and temperature dependence of photoluminescence in fluorescent dye doped tris(8-hydroxyquinoline) aluminum”, Proceedings of the SPIE Conference on Organic Light Emitting Materials and Devices X, San Diego, CA, August 2006, Volume 6333 Pp 63331V (2006).

2005

· R. Wang, W. Jia, H. Aziz, G. Vamvounis, S. Wang, N. Hu, Z. D. Popovic, J. Coggan “1-Methyl-2-(Anthryl)-Imidazo[4,5-f] [1,10]-Phenanthroline: A Highly Efficient Electron Transport Compound and a Bright Blue Emitter for Electroluminescent Devices”, Advanced Functional Materials 15, 1483 (2005).

· Z. D. Popovic and H. Aziz, “Delayed Electroluminescence In Small Molecule Based Organic Light Emitting Diodes – Evidence For Triplet-Triplet Annihilation And Recombination Center Mediated Light Generation Mechanism”, Journal of Applied Physics 98, 13510 (2005).

· Z. D. Popovic and H. Aziz, “Delayed Electroluminescence: A New Tool for Studies of OLED Fundamental Properties”, Proceedings of the SPIE Conference on Organic Light Emitting Materials and Devices IX,   San Diego CA, July 31-Aug.3, 2005, Volume 5937, Pp 126-132 (2005).

2004

· H. Aziz* and Z. D. Popovic, “Degradation Phenomena in Small-Molecule Organic Light Emitting Devices”, Chemistry of Materials 16, 4522 (2004).

· S.M. Tadayyon, H.M. Grandin, K. Griffiths, L.L. Coatsworth, P.R. Norton, H. Aziz and Z. D. Popovic, “Reliable and Reproducible Determination of Work Function and Ionization Potentials of Layers and Surfaces Relevant to Organic Light Emitting Diodes”, Organic Electronics 5, 199 (2004).

· S.M. Tadayyon, H.M. Grandin, K. Griffiths, P.R. Norton, H. Aziz and Z. D. Popovic, “CuPc Buffer Layer Role in OLED Performance: A Study of the Interfacial Band Enenrgies”, Organic Electronics 5, 157 (2004).

· G. Vamvounis, H. Aziz, N. Hu, and Z. D. Popovic “Temperature Dependence of Operational Stability of Organic Light Emitting Diodes Based on Mixed Emitter Layers”, Synthetic Metals 143, 69 (2004).

· S. Holdcroft, Y. Li, G. Vamvounis, H. Aziz, and Z. D. Popovic “Tuning Optical and Electroluminescent Properties of Poly(thiophene)e via Post-Functionalization”,  in “Chromogenic Phenomena in Polymers: Tunable Optical Properties” Edited by Samson A. Jenekhe and Douglas J. Kiserow, Oxford University Press, Sept 2004.

· H. Aziz, Y. Liew and Z.D. Popovic “Novel Cathode for Organic Light Emitting Devices with Reduced Optical Reflectivity” Proceedings of SPIE Conference on Organic Light Emitting Materials and Devices VII,  San Diego CA, Aug.3-6, 2003, Vol. 5214, Pp 277-282, (2004).

2003

· H. Aziz, Y. Liew,  H. M. Grandin and Z. Popovic “Reduced Reflectance Cathode For Organic Light Emitting Devices Using Metal-Organic Mixtures” ,  Applied Physics Letters  83, 186 (2003).

· H. M. Grandin,  H. Aziz,*  S. Gardner,  C. Jennings,  A.J. Paine,  P.R. Norton, and  Z. D. Popovic  “Light Absorption Phenomena in Novel Low Reflectance Cathodes for Organic Light Emitting Devices Utilizing Metal-Organic Mixtures”, Advanced Materials 15, 2021 (2003).

· H.M. Grandin, S.M. Tadayyon, W.N. Lennard, K. Griffiths, L.L. Coatsworth, P.R. Norton, Z. Popovic, H. Aziz, and  N. Hu, “Rutherford backscattering and secondary ion mass spectrometry of silver-tris-(8-hydroxyquinoline) aluminum interfaces” Organic Electronics 4, 9 (2003).

· H. Aziz and Z.D. Popovic “Study of Organic Light Emitting Devices with  5,6,11,12-tetraphenylnaphthacene (Rubrene)-doped Hole Transport Layer” Proceedings of SPIE Conference on Organic Light Emitting Materials and Devices VI,  Seatle WA, July 7-11, 2002, Vol. 4800, Pp 80-86, (2003).

· Z.D. Popovic, G. Vamvounis, H. Aziz, and N. Hu “OLEDs with enhanced high temperature operational stability”  Proceedings of SPIE Conference on Organic Light Emitting Materials and Devices VI,  Seatle WA, July 7-11, 2002, Vol. 4800, Pp 87-92, (2003).

2002

· H. Aziz and Z. Popovic, “Study of Organic Light Emitting Devices with  5,6,11,12-tetraphenylnaphthacene (Rubrene)-doped Hole Transport Layer”, Applied Physics Letters  80, 2180 (2002).

· H. Aziz, Z. Popovic and N. Hu, “Organic Light Emitting Devices with Enhanced Operational Stability at Elevated Temperatures”, Applied Physics Letters 81, 370 (2002).

· Turak, D. Grozea, X. D. Feng,  Z.H. Lu,  H. Aziz, and A. Hor,  “Metal/AlQ3 Interface Structures”, Applied Physics Letters 81, 766 (2002).

· P.N.M. dos Anjos, H. Aziz, N. Hu, and Z. D. Popovic, “Temperature dependence of electroluminescence degradation in organic light emitting devices without and with a copper phthalocyanine buffer layer”, Organic Electronics  3, 9 (2002).

· Z. Popovic and H. Aziz, “Reliability and Degradation of Small Molecule Organic Light Emitting Devices”,  IEEE Journal on Selected Topics in Quantum Electronics 8, 362, (2002). 

2001

· Z.D. Popovic, H. Aziz, N. Hu, A. Ioannidis, and P. N. M. dos Anjos, “Simultaneous electroluminescence and photoluminescence aging studies of tris(8-hydroxyquinoline) aluminum based organic light emitting devices” Journal of  Applied Physics 89, 4673 (2001).

· Z. Popovic, H. Aziz, A. Ioannidis, N. Hu and P.N.M. dos Anjos, “Time resolved fluorescence studies of AlQ3-based organic light emitting devices” Synthetic Metals 123, 179 (2001).

· H. Y. Yu, X. D. Feng, D. Grozea, Z. H. Lu, R. N. S. Sodhi, A-M. Hor and H. Aziz, “Surface electronic structure of plasma-treated indium tin oxides”, Applied Physics Letters 78, 2595 (2001).

· X. D. Feng, D. Grozea, A. Turak,  Z.H. Lu,  H. Aziz, and A.-M. Hor, “Studies Alq/Mg:Ag Interfaces in Organic Light-Emitting Diodes by XPS”  Proceedings of MRS Conference on Organic and Polymeric Materials and Devices – Optical, Electrical and Optoelectronic Properties, 2002, Vol. 725, Pp 31-36, (2002).

· H. Aziz, Z. Popovic, N.Hu, P. Dos Anjos and A. Ioannidis, “Degradation of tris(8-hydroxyquinoline) (ALQ3)-based organic light emitting devices (OLEDs)”  Proceedings of SPIE Conference on Organic Light Emitting Materials and Devices IV,  San Diego CA, July 30 – Aug.4, 2000, Vol. 4105, Pp 251-255, (2001).

2000

· Y. Liew, H. Aziz, N. Hu, H. Chan, G. Xu and Z. Popovic, “Investigation of the sites of dark spots in organic light-emitting devices” Applied Physics Letters  77, 2650 (2000).

· S.-F. Liu, C. Seward, H. Aziz, N.-X. Hu, Z. Popovic and S. Wang, “Syntheses, structures, and luminescence/electroluminescence of BPh2(mqp), Al(Ch3)(mqp)2, and Al(mqp)3 (mqp=2-(4’-Methylquinolinyl)-2-phenolato”, Organometallics 19, 5709 (2000).

· Z. Popovic, H. Aziz, N. Hu, A. Hor, and G. Xu, “Long-term degradation mechanism of tris(8-hydroxyquinoline)-based organic light emitting devices”,  Synthetic Metals 111-112, 229 (2000).

· S. Liu, Q. Wu, H.L. Schmider, H. Aziz,  N. Hu, Z. Popovic, S. Wang, “Syntheses, structures, and electroluminescence of new blue/green luminescent chelate compounds” Journal of the American Chemical Society  122, 3671 (2000).

· Z. D. Popovic, H. Aziz, N. Hu, P. N. M. dos Anjos, A. Ioannidis, “Degradation Mechanism of OLEDs based on AlQ3”, Conference Record of the 20th International Display Research Conference, pp. 333-336, Society for Information Display 2000.

· Z. D. Popovic, H. Aziz, N. Hu, P. N. M. dos Anjos, A. Ioannidis, “Long-term Degradation Mechanism in Small Molecule Based OLEDs”, Proceedings of IS&T’s NIP-16: International Conference on Digital Printing Technologies, pp. 350-353, The Society for Imaging Science and Technology 2000.

· H. Aziz, Z. Popovic, H. Hu, A. Hor, G. Xu “Long-term degradation mechanism of organic light emitting devices based on small molecules”, Mater. Res. Soc. Symp. Proc.  (2000),  558(Flat-Panel Displays and Sensors--Principles, Materials and Processes),  507-512

1999

· H. Aziz, Z.D. Popovic, N. Hu, A. Hor, and G. Xu, “Degradation mechanism of small molecule-based organic light-emitting devices” Science 283, 1900 (1999).

· Z. Popovic,  H. Aziz, N. Hu, A. Hor, and G. Xu,  “Mechanism of the intrinsic (long-term) degradation in AlQ3-based organic light emitting devices”, Proceedings of SPIE, Conference on Organic Light-Emitting Materials and Devices III, Denver, CO, July 1999, Vol. 3797, Pp 310-315.

1998

· H. Aziz, Z. Popovic, C.P. Tripp, N. Hu, A. Hor, and G. Xu, “Degradation processes at the cathode/organic interface in organic light emitting devices with Mg:Ag cathodes” Applied Physics Letters 72,  2642 (1998).

· H. Aziz, Z. Popovic, S. Xie, C.P. Tripp, N. Hu, A. Hor, and G. Xu, “Humidity-induced Crystallization of tris(8-hydroxyquinoline) aluminum layers in organic light emitting devices” Applied Physics Letters 72, 756-758 (1998).

· Z. Popovic,  H.  Aziz, C.P.Tripp, N. Hu, A. Hor, and G. Xu, “Improving the efficiency and stability of organic light-emitting devices using mixed emitting layers” Proceedings of SPIE, Conference on Organic Light-Emitting Materials and Devices II, San Diego, CA, July 1998, Vol. 3476, Pp 68-73.

1997

· H. Aziz, and G. Xu, “Electric-field-induced degradation of poly(p-phenylenevinylene) electroluminescent devices” Journal of Physical Chemistry B  101, 4009 (1997).

1996

· H. Aziz, and G. Xu, “A degradation mechanism of organic light-emitting devices” Synthetic Metals  80, 7 (1996).

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