• Bulletin of the Korean Chemical Society
• /
• 제31권10호
• /
• pp.2884-2888
• /
• 2010

Two red fluorescent DCJTB derivatives (Red 1 and 2) based on modified pyrans were synthesized and their electroluminescent properties were investigated. Multilayered OLEDs were fabricated with the device structure of ITO/NPB (40 nm)/Red 1, 2 or DCJTB (0.5 or 1%): $Alq_3$ (20 nm)/$Alq_3$ (40 nm)/Liq (2 nm)/Al. All devices exhibited efficient red emissions. In particular, a device containing emitter Red 2 as a dopant in the emitting layer, the maximum luminance was $8737\;cd/m^2$ at 12.0 V, the luminous and power efficiencies were 2.31 cd/A and 1.25 lm/W at $20\;mA/cm^2$, respectively. The peak wavelength of the electroluminescence was 638 nm with the CIE (x,y) coordinates of (0.63, 0.36) at 7.0 V.

• Bulletin of the Korean Chemical Society
• /
• 제33권10호
• /
• pp.3433-3436
• /
• 2012

• Bulletin of the Korean Chemical Society
• /
• 제32권4호
• /
• pp.1391-1394
• /
• 2011

• Bulletin of the Korean Chemical Society
• /
• 제32권12호
• /
• pp.4419-4422
• /
• 2011

• 한국생명과학회:학술대회논문집
• /
• 한국생명과학회 2001년도 제31회 학술심포지움 및 춘계학술대회
• /
• pp.26-27
• /
• 2001

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
• /
• pp.737-739
• /
• 2005

To increase light efficiency, utilizing phosphors transfers ultraviolet ray to visible light and the fluorescent characteristic without change the electrical or optical design. Spreading phosphors on the surface of light bulb mirror can compensate the red and blue light to yield this correct white field after being stimulated by reflected ultraviolet ray.

• 해양환경안전학회지
• /
• 제25권1호
• /
• pp.96-101
• /
• 2019

본 연구는 담녹조강 Tetraselmis suecica와 T. tetrathele의 인산염 흡수에 미치는 발광다이오드의 파장의 영향을 조사하였다. 파장은 청색 발광다이오드(LED; 450 nm), 황색 LED(590 nm), 적색 LED(630 nm) 그리고 형광램프(control)이며, 조도는 $100{\mu}mol\;m^{-2}\;s^{-1}$로 주사하였다. T. suecica와 T. tetrathele의 최대흡수속도(${\rho}_{max}$)는 적색 LED에서 $6.35pmol\;cell^{-1}\;hr^{-1}$와 $9.85pmol\;cell^{-1}\;hr^{-1}$로 나타났으며, 반포화농도(Ks)는 $9.43{\mu}M$와 $21.2{\mu}M$로 나타났다. 이는 적색 LED 아래에서 T. suecica와 T. tetrathele가 다른 파장보다 영양염에 대한 친화성이 높다는 것으로 의미한다. 따라서 경제성 및 생산성 향상을 위한 Tetraselmis 배양시스템(광배양기)의 최적 광원은 낮은 영양염 상태에서도 높은 생장속도를 보이는 적색 LED가 적합할 것으로 판단된다.

• 한국작물학회지
• /
• 제53권spc호
• /
• pp.103-107
• /
• 2008

인삼 4년생을 대상으로 해가림 색상을 달리하여 재배 시험한 결과, 대조구인 4중직 PE 차광망(청색 3 + 흑색 1중직)이나 청색 4중직 차광망에서 재배된 인삼의 뿌리 근중은 적색 4중직 차광망보다 높게 나타났으며, 대조구보다 청색과 적색에서 동체의 비율이 낮고 지근의 비율이 높아 투광량이 많아지면 동체의 생장이 감소하고 지근의 생장은 증가하였다. 뿌리에 함유된 진세노사이드 함량은 적색 해가림재배에서 가장 높게 나타나 투광량이 증가할수록 진세노사이드 함량이 증가되었으며, 특히 진세노사이드 Rg1의 함량이 유의적으로 더 높았다. 색상에 따른 진세노사이드 함량차이는 해가림 색상 차이에 의해 생합성 과정이 영향을 받은 것이 아닌 생육량의 차이에 따른 결과로 판단되었다.

• 복식
• /
• 제56권9호
• /
• pp.98-111
• /
• 2006

The objective of this research is to examine the commonness and differences of Korean, Chinese and Japanese costume colors of modern and present ages. The result of this study showed that modern China and Japan had quick influx speed of Western culture. Dissimilarly, modern Korea kept conception of colors from Chosun periods that show the high frequency of 'Five Elements Colors' and neutral colors in Red, Yellow and Purple Blue. Today, the costumes of China, Korea and Japan use similar tones of color but each country approached in different selections of achromatic colors; Korean prefers color in Yellow Red, Purple, and Chinese in Green Yellow, Green and Japanese in Purple Blue. Light greyish and pale toned Yellow Red and grayish tone have increased in modern Chinese and Japanese costumes. Also both countries have corresponding assumptions in using color of Red in strong tone. The analysis of color and tone distribution showed that, Japanese costume colors in modern and present times have correlative number of use as in Western culture. Traditionally, Japan has least notion of using 'Five Elements Colors' which only gives minor changes by convergence of Western color culture. In other side, China had developed in color rather than tone compares to Korea and Japan by using many of the Red color of strong, vivid and deep tones which made red distinguishing color of China. Japan continues to use of low chroma colors and became a characteristic in modern and present day, also they use an abundance of color in Yellow Red, purple Blue. Korea has a higher frequency showing in light, bright tones of color distinctively compares to China and Japan.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1999년도 추계학술대회 논문집
• /
• pp.606-609
• /
• 1999

We fabricated white light-emitting diode which have a mixed single emitting layer containing poly(N-vinylcarbazole), trois(8-hydroxyquinoline)aluminum and poly(3-hexylthiophene) and investigated the emission properties of it. It is possible to obtain a blue light from poly(N-vinylcarbazole). green light from tris(8-hydroxyquinoline)aluminum and red light from poly(3-hexylthiophene). The fabricated device emits white light with slight orange light. We think that the energy transfer in a mixed layer occurred from PVK to Alq₃ and P3HT resulted in decreasing the blue light intensity from PVK. We find that the efficiency of the white light electroluminescent device can be improved by injecting electron more effectively and blue light need to improve the color purity of white light.