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HTL:EML(DPVBi:NPB)층의 조성비 변화에 따른 청색 유기 발광 소자 개발
이태성,이병욱,홍진수,김창교,Lee, Tae-Sung,Lee, Byoung-Wook,Hong, Chin-Soo,Kim, Chang-Kyo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.9
The structure of organic light-emitting diodes(OLEDs) with typical heterostructure consists of anode, hole injection layer, hole transport layer, light-emitting layer, electron transport layer, electron injection layer, and cathode. 4,4bis[N-(1-napthyl)-N-phenyl-amino]-biphenyl(NPB) used as a hole transport layer and 4'4-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl(DPVBi) used as a blue light emitting layer were graded-mixed at selected ratio. Interface at heterojunction between the hole transport layer and the elecrtron transport layer restricts carrier's transfer. Mixing of the hole transport layer and the emitting layer reduces abrupt interface between the hole transport layer and the electron transport layer. The operating voltage of OLED devices with graded mixed-layer structure is 2.8 V at 1 $cd/m^2$ which is significantly lower than that of OLED device with typical heterostructure. The luminance of OLED devices with graded mixed-layer structure is 21,000 $cd/m^2$ , which is much higher than that of OLED device with typical heterostructure. This indicates that the graded mixed-layer enhances the movement of carriers by reducing the discontinuity of highest occupied molecular orbital(HOMO) of the interface between hole transport layer and emitting layer.
이태성(Tae-Sung Lee),이영화(Yong-Hwa Lee),김광수(Kwang-Soo Kim),장영석(Young-Seok Jang),이경보(Kyeong-Bo Lee) 한국신재생에너지학회 2015 신재생에너지 Vol.11 No.3
Biodiesel, which is most commonly derived from vegetable oils, and waste cooking oil, is an alternative to petroleumbased fuels. Since vegetable oils are also an important commodity in the food market, their prices are expected to increase substantilly given their broadening usage. Hence, waste animal fats are being considered as a promising cheap alternative feedstock for biodiesel production. Animal oil is extracted mainly from rendered tissue fats derived from livestock animals like pigs, chickens and cows. The objective of this study is to study the effects of extraction method of animal fatty tissues. Our extraction method is composed of high temperature extraction (100~140℃, 0.10 Mpa) is first applied to 40 kg of fat tissue for 2~3 h. Following this, the second step (70~ 100℃, -0.09 MPa), is applied for 60 min. This method resulted in a recovery of 69.4% of the total fat oil of the tissue. Major fatty acids from the extracted animal oils were palmitic, stearic, and oleic acid. Average contents and ranges of saturated fatty acids (SFA) palmitic acid and stearic acid, were 25.8% (23.5~28.9%), and 11.4% (7.8~14.4%), while those of unsaturated fatty acids (USFA) oleic acid and linoleic acid were 46.4% (41.6~51.7%) and 3.1% (1.4~8.1%), respectively.
이태성(Lee, Tae-Sung),이영화(Lee, Yong-Hwa),김광수(Kim, Kwang-Soo),김욱(Kim, Wook),김관수(Kim, Kwan-Su),장영석(Jang, Young-Seok),박광근(Park, Kwang-Geun) 한국신재생에너지학회 2012 신재생에너지 Vol.8 No.4
Biodiesel was produced by transesterification of vegetable oils and animal fats as an alternative to petroleum diesel. The research analysed the fuel characteristics of biodiesel, the yield of by-products and biodiesel, using several vegetable oils - rapeseed oil, camellia oil, peanut oil, sesame oil, perilla oil, palm oil, olive oil, soybean oil, sunflower oil and animal fats such as lard, tallow, and chicken fat. The results showed the yields of biodiesel made from the vegetable oils and animal fats were 90.8{pm}1.4{sim}96.4{pm}0.9% and 84.9{pm}1.1{sim}89.6{pm}1.5% respectively. Production rates and oxidation characteristics were different depending on the fats applied.
이태성(Lee, Tae-Sung),이영화(Lee, Yong-Hwa),김광수(Kim, Kwang-Su),조현준(Cho, Hyun-Jun),장영석(Jang, Yong-Sek),박광근(Park, Kwang-Geun) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
바이오디젤의 생산은 원료유의 순도와 촉매 종류, 알코올의 양, 반응시간, 반응 온도와 같은 다양한 조건을 이용하여 최적의 조건을 찾아내는 것이 중요하며 이는 곧 생산단가와 직결된다. 바이오디젤 전환 시 고체촉매를 이용하면 후처리 공정의 단순화가 가능하며 글리세린의 순도가 약 98%로 매우 높아져 고부가 물질 생산 원료로 활용이 가능하다는 장점이 있으며 생산 단가를 4~20% 가량 낮출 수 있다. 본 연구에서는 바이오디젤의 경제적인 생산을 위하여 정제공정을 단순화 시킬 수 있는 방안으로 3종의 고체촉매를 이용하여 동 식물성 유지의 바이오디젤로 전환 실험을 수행 하였다. 촉매 활성화를 위하여 고체촉매를 700?C에서 3~5시간 소성하고 동 식물성 유지를 이용 전이에스테르화 반응실험을 수행하여 30분 간격으로 시료를 수집 하였다. 실험 결과, 동물성 폐유지로부터 반응 120분 후에 최대 90% 이상의 지방산 메틸에스테르로의 전환율을 얻을 수 있었으며 식물성 유지인 팜유에서는 86%, 유채유에서는 64%의 전환율을 나타냈다. 동 식물성 유지의 초기 산가는 0.45~2mg KOH/g 사이로 나타났다.