MSGID: 1:317/3 64a8e684   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    A bright future in eco-friendly light devices, just add dendrimers,   
   cellulose, and graphene    
      
     Date:   
         July 7, 2023   
     Source:   
         Kyushu University   
     Summary:   
         Researchers have developed a light-emitting electrochemical   
         cell using dendrimers, a material gaining popularity in   
         the industry. Moreover, the team found that using biomass   
         derived cellulose acetate as the electrolyte retains the cell's   
         long-life span. Combined with a graphene electrode, the cell has   
         the potential to light the way for a future of eco-friendly and   
         flexible light-emitting devices.   
      
      
         Facebook Twitter Pinterest LinkedIN Email   
      
   ==========================================================================   
   FULL STORY   
   ==========================================================================   
   In research that could lead to a new age in illumination, researchers   
   from Japan and Germany have developed an eco-friendly light-emitting   
   electrochemical cells using new molecules called dendrimers combined   
   with biomass derived electrolytes and graphene-based electrodes. Their   
   findings were published in the journal Advanced Functional Materials.   
      
   Electroluminescence is the phenomenon where a material emits light   
   in response to a passing electric current. Everything from the screen   
   you're using to read this sentence to the lasers used in cutting edge   
   scientific research are results of the electroluminescence of different   
   materials. Due to its ubiquity and necessity in the modern age, it is   
   only natural that extensive resources go into research and development   
   to make this technology better.   
      
   "One such example of an emerging technology is 'light-emitting   
   electrochemical cells' or LECs," explains Associate Professor Ken   
   Albrechtfrom Kyushu University's Institute for Materials Chemistry and   
   Engineering and one of the leads of the study. "They have been attracting   
   attention because of their cost advantage over organic light emitting   
   diodes, or OLEDs. Another reason for LECs popularity is their simplified   
   structure."  OLED devices generally require the carful layering of   
   multiple organic films, making it tricky and costly to manufacture. LECs   
   on the other hand can be made with a single layer of organic film mixed   
   with light-emitting materials and an electrolyte. The electrode that   
   connects it all together can even be made from inexpensive materials   
   unlike the rare or heavy metals used in OLEDs. Moreover, LECs have lower   
   driving voltage, meaning they consume less energy.   
      
   "Our research teams have been exploring new organic materials that can be   
   used in LECs. One such candidate are dendrimers," explains Prof. Rube'n   
   D. Costa of the Technical University of Munich, who led the research   
   team in Germany.   
      
   "These are branched symmetric polymeric molecules whose unique structure   
   has led to their utility in everything from medicine to sensors, and   
   now in optics."  Building upon their past work on developing dendrimers,   
   the research team began modifying their materials for LECs.   
      
   "The dendrimer we developed initially had hydrophobic, or water repelling,   
   molecular groups. By replacing this with hydrophilic, or water liking,   
   groups we found that the lifetime of the LEC device could be extended   
   to over 1000 hours, more than 10-fold from the original," explains   
   Albrecht. "What makes it even better is that thanks to our collaboration   
   with Dr Costa's team the device is very eco-friendly."  For years,   
   Costa's team in Germany had been working on developing cheaper and more   
   environmentally friendly materials in light-emitting devices. One material   
   they have been experimenting with is cellulose acetate, a common organic   
   compound used in everything from clothing fibers and eyeglass frames.   
      
   "We used biomass derived cellulose acetate as the electrolyte in our   
   new LEC device, and confirmed that it has the same long-life span,"   
   continues Costa.   
      
   "Moreover, we also found that graphene can be used as an electrode   
   as well.   
      
   This is a vital step toward making flexible light-emitting devices using   
   environmentally friendly materials."  The team explains that while their   
   work is promising more research is necessary before the devices can be   
   made to market.   
      
   "The device we made here only illuminates in yellow, so we need to develop   
   it to illuminate in the three primary light colors: blue, green, and red.   
      
   Luminescence efficiency, how bright the light is, also needs work,"   
   concludes Albrecht. "Though thanks to our international collaboration,   
   the future looks bright."   
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Optics # Graphene # Chemistry # Materials_Science   
                   # Inorganic_Chemistry # Civil_Engineering #   
                   Engineering_and_Construction # Organic_Chemistry   
       * RELATED_TERMS   
             o Solar_cell o Electroluminescence o Xenon o Photography o   
             Gallium o Solar_power o Optics o Electric_power   
      
   ==========================================================================   
      
    Print   
      
    Email   
      
    Share   
   ==========================================================================   
   ****** 1 ****** ***** 2 ***** **** 3 ****   
   *** 4 *** ** 5 ** Breaking this hour   
   ==========================================================================   
       * Six_Foods_to_Boost_Cardiovascular_Health   
       * Cystic_Fibrosis:_Lasting_Improvement *   
       Artificial_Cells_Demonstrate_That_'Life_...   
      
       * Advice_to_Limit_High-Fat_Dairy_Foods_Challenged   
       * First_Snapshots_of_Fermion_Pairs *   
       Why_No_Kangaroos_in_Bali;_No_Tigers_in_Australia   
       * New_Route_for_Treating_Cancer:_Chromosomes *   
       Giant_Stone_Artefacts_Found:_Prehistoric_Tools   
       * Astonishing_Secrets_of_Tunicate_Origins *   
       Most_Distant_Active_Supermassive_Black_Hole   
      
   Trending Topics this week   
   ==========================================================================   
   SPACE_&_TIME Asteroids,_Comets_and_Meteors Big_Bang Jupiter   
   MATTER_&_ENERGY Construction Materials_Science Civil_Engineering   
   COMPUTERS_&_MATH Educational_Technology Communications   
   Mathematical_Modeling   
      
      
   ==========================================================================   
      
   Strange & Offbeat   
   ==========================================================================   
   SPACE_&_TIME   
   Quasar_'Clocks'_Show_Universe_Was_Five_Times_Slower_Soon_After_the_Big_Bang   
   First_'Ghost_Particle'_Image_of_Milky_Way   
   Gullies_on_Mars_Could_Have_Been_Formed_by_Recent_Periods_of_Liquid_Meltwater,   
   Study_Suggests MATTER_&_ENERGY Holograms_for_Life:_Improving_IVF_Success   
   Researchers_Create_Highly_Conductive_Metallic_Gel_for_3D_Printing   
   Artificial_Cells_Demonstrate_That_'Life_Finds_a_Way' COMPUTERS_&_MATH   
   Number_Cruncher_Calculates_Whether_Whales_Are_Acting_Weirdly   
   AI_Tests_Into_Top_1%_for_Original_Creative_Thinking   
   Growing_Bio-Inspired_Polymer_Brains_for_Artificial_Neural_Networks Story   
   Source: Materials provided by Kyushu_University. Note: Content may be   
   edited for style and length.   
      
      
   ==========================================================================   
   Journal Reference:   
      1. Luca M. Cavinato, Keiko Yamaoka, Sophia Lipinski, Vladimir Calvi,   
         Dominique Wehenkel, Richard van Rijn, Ken Albrecht, Rube'n D. Costa.   
      
         Dendri‐LEC Family: Establishing the Bright Future for   
         Dendrimer Emitters in Traditional and Graphene‐Based   
         Light‐Emitting Electrochemical Cells. Advanced Functional   
         Materials, 2023; DOI: 10.1002/ adfm.202302483   
   ==========================================================================   
      
   Link to news story:   
   https://www.sciencedaily.com/releases/2023/07/230707111656.htm   
      
   --- up 1 year, 18 weeks, 4 days, 10 hours, 50 minutes   
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)   
   SEEN-BY: 15/0 106/201 114/705 123/120 153/7715 218/700 226/30 227/114   
   SEEN-BY: 229/110 112 113 307 317 400 426 428 470 664 700 291/111 292/854   
   SEEN-BY: 298/25 305/3 317/3 320/219 396/45 5075/35   
   PATH: 317/3 229/426