Efficient Electron Transport Material Research Articles

5.2: Performance of Highly Efficient Electron Transporting Materials in OLED Displays

In this paper, we describe a new class of highly efficient electron-transporting materials evaluated using basic and advanced organic light-emitting diode (OLED) device structures. Data collected showed that the new class of materials provides higher device efficiency with lower operating drive voltage resulting in lower power-consuming devices. Competitive device lifetimes were also observed with some device structures showing significant improvements for the new materials. The data presented in this paper show that the advancements in efficiency and drive voltage can be realized in blue and red devices.

55.2: Bipyridyl Oxadiazoles as a New Class of Durable and Efficient Electron-Transporting Materials

We demonstrate a new class of high-performance electron transporting (ET) molecular materials for organic light-emitting devices (OLEDs.) The bipyridyl-substituted oxadiazole derivatives potentially have excellent ET and electron-accepting ability and also exhibit good thermal stability. We demonstrate for the first time that pure organic compounds, composed of only carbon, hydrogen, nitrogen, and oxygen, can provide good ET properties with practical operational durability in OLEDs.

Luminescence Properties and Energy Transfer Processes in Fluorescent and Phosphorescent Tris(Phenylquinoxaline)

ABSTRACTWe have studied the photophysical properties and energy transfer processes in tris(phenylquinoxalines ) (TPQ). TPQs emit blue fluorescence with a maximum at 2.9 eV as well as green phosphorescence at 2.2 eV. When doped with a phosphorescent dye efficient energy transfer takes place from the excited singlet and triplet state of the TPQ host to the guest molecules. The mechanism of energy transfer can be understood in the frame of Förster's theory of dipole-dipole interaction. Besides the interesting photophysical properties, TPQs are also very efficient electron transport materials. Red light-emitting diodes utilizing doped TPQ as emitter and electron transport layer have been prepared and electroluminescence properties investigated.

Estimated reliability of the results of ultrasonic inspection of tubes: Defektoskopiya, No 1 (1968) pp 40–47

Advances made in methods of synthesis of siloles during the period 1996 to the end of 2009 are described. The earliest general method involved reductive dimerization of tolan with lithium metal followed by quenching with a dichlorosilane, trichlorosilane, or silicon tetrachloride. Versatile new methods involve the intramolecular cyclization of dialkynylsilanes in the presence of lithium naphthalenide (Tamao method) and 1,1-organoboration with a trialkylborane (Wrackmeyer method) each of which provides an entry into different types of substitution patterns in the silole product. Supplementing the reductive-coupling route to siloles has been both stoichiometric and catalyzed processes mediated by transition metal complexes. Various, less general synthetic methods are also described. Reactions of siloles at either the silicon center or the ring carbon centers that retain the silole skeleton are included. Characterization methods used to confirm the siloles are included in tabular form, and uses or applications of the silole are also summarized. Fluorescent data are highlighted for selected siloles as is the aggregation-induced emission phenomenon generally exhibited by this class of compounds. Various oligomers and polymers that contain siloles have been reported and include oligo- and poly-(1,1-siloles) as well as polymers where organic bridges connect to the silole in the 1-position or at a ring carbon position. Siloles have been used as core components for efficient electron-transporting materials and their incorporation into OLED devices and the characteristics of such devices is summarized.

Dual frequency ultrasonic fluid flowmeter: The Review of Scientific Instruments, Vol 39, No 9 (September 1968)

Advances made in methods of synthesis of siloles during the period 1996 to the end of 2009 are described. The earliest general method involved reductive dimerization of tolan with lithium metal followed by quenching with a dichlorosilane, trichlorosilane, or silicon tetrachloride. Versatile new methods involve the intramolecular cyclization of dialkynylsilanes in the presence of lithium naphthalenide (Tamao method) and 1,1-organoboration with a trialkylborane (Wrackmeyer method) each of which provides an entry into different types of substitution patterns in the silole product. Supplementing the reductive-coupling route to siloles has been both stoichiometric and catalyzed processes mediated by transition metal complexes. Various, less general synthetic methods are also described. Reactions of siloles at either the silicon center or the ring carbon centers that retain the silole skeleton are included. Characterization methods used to confirm the siloles are included in tabular form, and uses or applications of the silole are also summarized. Fluorescent data are highlighted for selected siloles as is the aggregation-induced emission phenomenon generally exhibited by this class of compounds. Various oligomers and polymers that contain siloles have been reported and include oligo- and poly-(1,1-siloles) as well as polymers where organic bridges connect to the silole in the 1-position or at a ring carbon position. Siloles have been used as core components for efficient electron-transporting materials and their incorporation into OLED devices and the characteristics of such devices is summarized.