| POLYMERS Vol.62 No.4 |
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COVER STORY
Polymers Active in Lighting in the New Era |
| COVER STORY: Highlight Reviews |
| Development of White Organic Light-Emitting Devices for General Lighting | Hisahiro SASABE, Junji KIDO |
| <Abstract> Since
the development of the first white organic light-emitting device (OLED)
in 1993, twenty years have passed. The power efficacy and lifetime of
that former white OLED were reportedly only < 1 lm W-1 and < 1
day, respectively. However, recent rapid advances in material chemistry
have enabled white OLED to be used for general lighting. In 2012, white
OLED panel efficacy reached 90 lm W-1 at 1,000 cd m-2, and a tandem white
OLED panel realized lifetime of over 100,000 hrs. White OLED is particularly
useful where lightweight illumination panels are required, such as in
aircraft and space shuttles, and is expected to open new possiblities
of novel lighting designs, such
as transparent lighting panels and luminescent wallpapers. In this report,
we explore recent developments of white OLED, especially three key technologies
in material chemistry; (1) low operating voltage technology, (2) phosphorescent
OLED technology and (3) multiphoton emission device
technology. Keywords: Organic Light-Emitting Device / General Lighting / High-Performance / Phosphorescent Materials / Low Driving Voltage / Multiphoton Emission Device / Charge Generation Layer / Molecular Orientation |
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| Lighting Art Entertainment |
| Design of
light that produces the dreams and excitement: The example of the lighting of “Lighting Object 2012” |
Yoko Luna NIKI |
| <Abstract> Every Japanese has a memory of viewing the full moon. I am to integrate into our work on such items as lighting and producing shapes the attractiveness and images associated with the “transitions” of the moon, which is an important element in designing space. |
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| COVER STORY: Topics and Products |
| Latest Trends and Challenges in OLED Lighting Technologies | Toshihiko IWASAKI |
| <Abstract> We
report recent progress and future prospects of OLED lighting based on
KONICA MINOLTA’s development activities. We have been working on two
approaches, vacuum thermal evaporation and solution processing, to make
white OLED lighting using proprietary blue phosphorescent technology.
In 2011, the world's first all-phosphorescent OLED lighting panel was
brought into market, which has been the best candidate technology to
achieve the attractive performance as the lighting application, especially
considering efficacy. On the other hand, we demonstrated the feasibility of the solution-processed OLED technology by showing unique OLED lighting prototype fabricated by the roll-to-roll R&D line in 2010. Though solution-processed OLED has potential for high productivity and large-scale fabrication capability, it is widely believed that the device performances fabricated by the solution process are inferior to that of vacuum process so far. In this paper, recent OLED performance using our new blue phosphorescent material by vacuum process and the overview of solution processed OLED development are discussed. Keywords: Organic Lighing Emitting Diode / White OLED Lighting / Phosphorescent Material / Vaccum Thermal Evaporation / Solution Process / Roll-to-Roll Process |
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| Thermally-Conductive Polycarbonate Compound | Keiichiro INO |
| <Abstract> Polymer
materials have lower thermal conductivity than metal materials and ceramics.
Therefore, polymer materials are used as thermal insulations. Polymer
materials are used for various products because of excellent injection
moldability. These days, electronic devices are increasingly using highly
efficient semiconductors. Calorific value of an electronic device increases
with the miniaturization of semiconductors, and its high integration.
To maintain the performance of an electronic device, a sufficient cooling
system is required. For test results, the 6 mm interval of the radiating
fin - fin is desirable. Thermally conductive polycarbonate composite
has a thermal conductivity of 4.0 - 11.0 W/m・K. The effective range that performs heat conduction is 25 mm at the maximum, 25 mm height of a radiating fin is desirable. Around 3 mm thickness of a radiating fin is desirable, and around 5 mm thickness of the base cast by the side of a LED module is desirable to secure a heat current way, and for injection moldability. Keywords: Thermally / Conductive / Polycarbonate / Composite / Radiate / LED / Moldability |
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| Heat-Resistant Polyamides for LED Reflectors | Kozo TAMURA |
| <Abstract> Genestar™,
a PA9T-based heat resistant polyamide, is widely used as a reflector
for LED packages due to its good mold-ability, heat resistance, and light
resistance. We believe Genestar™ and its new
polymer, with superior resistance against heat and light, will help LED
to be a standard light source for lighting applications. Keywords: LED Reflector / Polyamide / Heat Resistance / Light Resistance |
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| Light Diffusion Polycarbonate for LED Lighting | Eiji NAKAISHI |
| <Abstract> Sumika
Styron Polycarbonate Limited developed light diffusion grade SD POLYCA™ LD2050 series, which have excellent light transmittance and diffusion
properties for applications in the LED lighting field. Keywords: LED Lighting / Light Diffusion / Polycarbonate |
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| Design of LED Condenser Lens Using HSOT Polymer | Yoshinori SHINOHARA |
| <Abstract> This
introduces highly efficient controls of LED Condenser Lens over light
distribution angles, which utilizes scattering characteristics of Highly
Scattering Optical Transmission Polymer and applications to LED down
lighting. Keywords: Polymer Lens |
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| Polymer Science and I: A Personal Account |
| Professional Grow from Green Ideas | Taka-Aki ASOH |
| <Abstract> Having good ideas is one of the most important things for researchers. Is my approach a green idea? What should be done about it? I believe that professional grows up from green idea by making continuous efforts. |
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| Front-Line Polymer Science |
| Transformation of Cellulosic Biomass into High-Value-Added Chemicals for Polymers | Michikazu HARA |
| <Abstract> Emerging
trends in chemical industry are prompting sustainable production of useful
chemicals, including polymers and new materials, from renewable cellulosic
biomass. This requires at least two chemical processes: hydrolysis of
cellulosic biomass into mono saccharides and tranformations of monosaccharides
into useful chemicals. However, efficient transformations of cellulosic
biomass and monosaccharides are no easy task. Here, we demonstrate efficient
cellulosic biomass transformation into heterocyclic aldehydes by novel
heterogeneous catalysts. Keywords: Cellulosic Biomass / Monosaccharide / Hydrolysis / Heterocyclic Aldehyde / Heterogeneous Catalysts |
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