Browsing by Author "Chu, TY"

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Ab initio molecular orbital study of 1,3,5-triazine derivatives for phosphorescent organic light emitting devices
(2005-10-24)
Chu, TY
;
Ho, MH
;
Chen, JF
;
Chen, CH
;
電子物理學系
Novel triplet host materials 2,4,6-tris(diarylamino)-1,3,5-triazine derivatives (TRZ1-TRZ4) have been reported and from which TRZ2 as a host for Ir(ppy)(3) was particularly useful in producing high efficiency phosphorescent organic light emitting diodes (OLEDs). This Letter reports the molecular orbital and energy level of these derivatives determined by ab initio calculation. The calculated triplet bandgap energy of TRZ1 has been found to be larger than that of TRZ2 and the TRZ1 molecules and has the lowest dipole moment which infers the highest carrier mobility. Therefore, TRZ1 has the potential to be a superb triplet host material and electron transport material. (c) 2005 Elsevier B.V. All rights reserved.
Characterization of electronic structure of aluminum (III) bis(2-methyl-8-quninolinato)-4-phenylphenolate (BAlq) for phosphorescent organic light emitting devices
(2005-03-07)
Chu, TY
;
Wu, YS
;
Chen, JF
;
Chen, CH
;
電子物理學系
The structure of the triplet host material, aluminum (111) bis(2-metliyl-8-quninotinato)-4-phenylphenolate (BAlq), has been optimized by density functional theory (DFT) with B3LYP methods to study the electronic distribution of its HOMO and LUMO energy states. Calculated triplet bandgap energy of BAlq is shown to be consistent with the experimental data. By analyzing the partial density states (PDOS) of these ligands contributing to the total density of states (TDOS), it is concluded that the HOMO and LUMO orbitals of BAlq are mainly localized on the 4-phenylphenol and 2-methyl-8-hydroxyquin oline ligands, respectively. (C) 2005 Elsevier B.V. All rights reserved.
Identifying the combination of genetic factors that determine susceptibility to cervical cancer
(2004-03-01)
Horng, JT
;
Hu, KC
;
Wu, LC
;
Huang, HD
;
Lin, FM
Although infection with high-risk types of human papillomavirus (HPV) has been identified as the primary cause of cervical cancer, only some of those infected go on to develop cervical cancer. Obviously, the progression from HPV infection to cancer involves other environmental and host factors. Recent population-based twin and family studies have demonstrated the importance of the hereditary component of cervical cancer, associated with genetic susceptibility. Consequently, single-nucleotide polymorphism (SNP) markers and microsatellites should be considered genetic factors for determining what combinations of genetic factors are involved in precancerous changes to cervical cancer. This study employs a Bayesian network and four different decision tree algorithms, and compares the performance of these learning algorithms. The results of this study raise the possibility of investigations that could identify combinations of genetic factors, such as SNPs and microsatellites, that influence the risk associated with common complex multifactorial diseases, such as cervical cancer.
Ultrathin electron injection layer on indium-tin oxide bottom cathode for highly efficient inverted organic. light-emitting diodes
(2006-06-01)
Chu, TY
;
Chen, SY
;
Chen, JF
;
Chen, CH
;
電子物理學系
We have fabricated a highly efficient inverted bottom-emission organic light-emitting diode (IBOLED) based on an indium-tin oxide (ITO) bottom cathode deposited with an ultrathin 1 nm layer of Mg to promote electron injection. The threshold voltage of this IBOLED with a structure of ITO/Mg/Alq(3)/NPB/WO3/Al was 4.2V and an efficiencies of 4.66cd/A and 1.51 1m/W were achieved at an operational voltage of 8.9 V and a brightness of 940 cd/m(2). In comparison with an ITO/Alq(3) bottom cathode composition, a reduction in drive voltage from 13.8 to 7.8 V in voltage was obtained at 1 mA/cm(2). A charge-transfer dipole model is proposed to rationalize the enhanced electron injection.