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RISS 인기검색어
- 검색키워드
- 저자 : Shin Kawami (검색결과 3 건)
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Shin, Hyeon-Ho,Yoon, Yang-Ho,Kawami, Hisae,Iwataki, Mitsunori,Matsuoka, Kazumi The Korean Society of Phycology 2008 ALGAE Vol.23 No.4
In Gamak Bay, Paralytic Shellfish Poisoning (PSP) was first detected from seafoods in 2003, however the toxin source is unknown yet. In this study, we report potential PSP producers of toxic dinoflagellates, describing morphology and abundance of cysts isolated from surface sediment of Gamak Bay. The most abundant type in these cysts was characterized with ellipsoidal and transparent wall identical to Alexandrium catenella and/or A. tamarense. Germination experiment of the cysts revealed that all motile cells germinated were morphologically identified as A. tamarense. This result suggests that A. tamarense may relate to PSP contaminations in Gamak Bay. Moreover, bottom water temperature in Gamak Bay is favorable for germination of A. tamarense cysts. Further studies are required to carry out the PSP monitoring for preventing the risk of PSP events that may outbreak in future at Gamak Bay.
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Organic LED device based on PtOEP phosphor without dopingin host material
Taiju Tsuboi,Masayuki Tanigawa,Shin Kawami,Taishi Tsuji 한국물리학회 2005 Current Applied Physics Vol.5 No.6
Electroluminescence (EL) and photoluminescence (PL) have been studied on multi-layer organic light-emitting diode (OLED)devices based on phosphorescent platinum octaethyl porphine (PtOEP) molecule. A multi-layer OLED (called Pt5) which has100% PtOEP without doping in host as the emitting layer is investigated and compared its EL and PL characteristics with thoseof the other OLEDs (Pt2 and Pt3) with emitting layer of PtOEP doped in 4,40-N,N0-dicarbazole-biphenyl (CBP) host material. Itis observed that Pt5 shows a lower EL eciency than Pt2 and Pt3. Three broad EL bands are observed at 500, 527 and 570nmin the multi-layer device in addition to red sharp EL band due to PtOEP in Pt5, while only the red PtOEP EL is observed inPt2 and Pt3. The 500, 527 and 570nm EL peaks arise from absorption of the broad 525nm Alq3 emission band by PtOEP layer.The emission from the Alq3 electron-transport layer is caused by the carrier leakage from the hole-blocking BAlq layer. The inten-sity of red EL due to PtOEP is much weaker in Pt5 than in Pt2. Taking into account the result of PL, it is suggested that highlyecient energy transfer from CBP host to PtOEP guest occurs in Pt2 and Pt3, giving rise to higher PtOEP luminance, while con-centration quenching occurs in PtOEP layer in Pt5..
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New emission band of PtOEP phosphor in organic LED devices
Taiju Tsuboi,Masayuki Tanigawa,Shin Kawami,Taishi Tsuji 한국물리학회 2005 Current Applied Physics Vol.5 No.1
Electroluminescence (EL) and transient EL response have been studied on organic light-emitting diode (OLED) devices based onphosphorescent PtOEP molecule. As the emitting layer, we used layer of PtOEP doped in CBP host material and layer formed by100%PtOEP (without doping in host). Three EL bands are observed at 500, 527 and 570 nm in the latter device besides red EL dueto PtOEP. The 500 and 527 nm ELs are attributed to emission from hole- and electron-transport layers, respectively, while the 570nm EL to emission from exciplex formed at the interface between the hole-blocking layer and emitting layer. Weak emission fromthe thermally populated triplet state is observed in single layer OLED device with 100%PtOEP layer and multi-layer device withPtOEP doped in host. Double exponential decay is observed in the electrophoresecence in the 100%PtOEP layer device, while asingle exponential decay is observed in the device with PtOEP doped in host.
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