Browsing by Author "Kung, Liang-Rern"

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A solution-processable bipolar molecular glass as a host material for white electrophosphorescent devices
(2008)
Chien, Chen-Han
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Kung, Liang-Rern
;
Wu, Chen-Hao
;
Shu, Ching-Fong
;
Chang, Sheng-Yuan
A solution-processable bipolar material tBu-OXDTFA comprising an electron-rich triphenylamine core and electron-deficient oxadiazole/ fluorene peripheries was synthesized. This dendrimer-like molecule not only possesses a high triplet energy (2.74 eV) but also exhibits excellent film-forming properties upon solution processing. We achieved highly efficient white electrophosphorescent OLEDs (22.3 cd A(-1), 11.6%) through solution processing, wherein the single white emitting layer was readily formed after spin-coating a solution of blue- and red-phosphor co-dopants containing tBu-OXDTFA as the host matrix.
Synthesis of benzothiadiazole-based liquid crystalline polyacrylates for polarized light emitting diodes
(2006-08-01)
Yao, Yung-Hsin
;
Kung, Liang-Rern
;
Hsu, Chain-Shu
;
應用化學系
;
Department of Applied Chemistry
Two benzothiadiazole-based liquid crystalline polyacrylates were synthesized. These polymers revealed a nematic liquid crystal phase and exhibited photoluminescence as well as polarized electroluminescence when incorporated into light-emitting diode applications. The polymers showed-dichroic ratios of about 8.3-8.8 in UV-vis absorption and photoluminescence emission. The polymer with vinylene linkages (P2) showed better electroluminescence device performance than that with acetylene linkages (P1). The P2 device emitted red light at 604 nm with a turn-on voltage at 6 V, and a maximum polarized luminance of 235 cd/m(2) at 12 V, with an efficiency of 0.09 cd/A and a polarization ratio of 6.5.