• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      Search 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • Search
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • Search
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Search

      Show Advanced FiltersHide Advanced Filters

      Filters

      Use filters to refine the search results.

      Now showing items 31-40 of 50

      • Sort Options:
      • Relevance
      • Title Asc
      • Title Desc
      • Issue Date Asc
      • Issue Date Desc
      • Results Per Page:
      • 5
      • 10
      • 20
      • 40
      • 60
      • 80
      • 100
      Thumbnail

      Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off 

      Liu, S. W.; Sun, X. W.; Demir, Hilmi Volkan (A I P Publishing LLC, 2012)
      We demonstrated graded-host phosphorescent organic light-emitting diodes with high efficiency and reduced efficiency roll-off. The emissive layer of the graded host device consists of both electron and hole transport type ...
      Thumbnail

      Warm-White light-Emitting diodes integrated with colloidal quantum dots for high luminous efficacy and color rendering: Reply to comment 

      Nizamoglu, S.; Erdem, T.; Sun X.W.; Demir, Hilmi Volkan (2011)
      The correlated color temperatures and the corresponding color rendering indices calculated using actual experimental data (and not any prediction) in the original Letter [Opt. Lett. 35, 3372 (2010)] are correct. In addition, ...
      Thumbnail

      Colloidal quantum dot light-emitting diodes employing phosphorescent small organic molecules as efficient exciton harvesters 

      Mutlugun, E.; Guzelturk, B.; Abiyasa, A. P.; Gao, Y.; Sun X. W.; Demir, Hilmi Volkan (American Chemical Society, 2014)
      Nonradiative energy transfer (NRET) is an alternative excitation mechanism in colloidal quantum dot (QD) based electroluminescent devices (QLEDs). Here, we develop hybrid highly spectrally pure QLEDs that facilitate energy ...
      Thumbnail

      A charge inverter for III-nitride light-emitting diodes 

      Zhang Z.-H.; Zhang, Y.; Bi, W.; Geng, C.; Xu S.; Demir, Hilmi Volkan; Sun, X. W. (American Institute of Physics Inc., 2016)
      In this work, we propose a charge inverter that substantially increases the hole injection efficiency for InGaN/GaN light-emitting diodes (LEDs). The charge inverter consists of a metal/electrode, an insulator, and a ...
      Thumbnail

      Enhanced hole transport in InGaN/GaN multiple quantum well light-emitting diodes with a p-type doped quantum barrier 

      Ji Y.; Zhang, Z. -H.; Tan S.T.; Ju, Z. G.; Kyaw, Z.; Hasanov N.; Liu W.; Sun X. W.; Demir, Hilmi Volkan (Optical Society of America, 2013)
      We study hole transport behavior of InGaN/GaN light-emitting diodes with the dual wavelength emission method. It is found that at low injection levels, light emission is mainly from quantum wells near p-GaN, indicating ...
      Thumbnail

      Improving hole injection efficiency by manipulating the hole transport mechanism through p-type electron blocking layer engineering 

      Zhang, Zi-Hui; Ju, Z.; Liu W.; Tan S.T.; Ji Y.; Kyaw, Z.; Zhang X.; Hasanov N.; Sun, X. W.; Demir, Hilmi Volkan (Optical Society of America, 2014)
      The p-type AlGaN electron blocking layer (EBL) is widely used in InGaN/GaN light-emitting diodes (LEDs) for electron overflow suppression. However, a typical EBL also reduces the hole injection efficiency, because holes ...
      Thumbnail

      Construction of multi-layered white emitting organic nanoparticles by clicking polymers 

      Keita, H.; Güzeltürk, B.; Pennakalathil, J.; Erdem, T.; Demir, Hilmi Volkan; Tuncel, D. (Royal Society of Chemistry, 2015)
      A series of blue, green and red emitting polymers that are appropriately functionalized with alkyne and azide functional groups have been prepared and clicked together to construct bi-layered and tri-layered white emitting ...
      Thumbnail

      Electroluminescence efficiency enhancement in quantum dot light-emitting diodes by embedding a silver nanoisland layer 

      Yang, X.; Hernandez-Martinez, P. L.; Dang C.; Mutlugün, E.; Zhang, K.; Demir, Hilmi Volkan; Sun X. W. (Wiley-VCH Verlag, 2015)
      A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced electroluminescence by embedding a thin layer of Ag nanoislands into hole transport layer. The maximum external quantum efficiency ...
      Thumbnail

      Quantum efficiency enhancement in nanocrystals using nonradiative energy transfer with optimized donor-acceptor ratio for hybrid LEDs 

      Nizamoglu, S.; Akin, O.; Demir, Hilmi Volkan (American Institute of Physics, 2009-06-17)
      The quantum efficiency enhancement in nanocrystal solids is critically important for their efficient use as luminophors on color-conversion light emitting diodes (LEDs). For this purpose, we investigate energy gradient ...
      Thumbnail

      On the hole accelerator for III-nitride light-emitting diodes 

      Zhang Z.-H.; Zhang, Y.; Bi, W.; Geng, C.; Xu S.; Demir, Hilmi Volkan; Sun, X. W. (American Institute of Physics Inc., 2016)
      In this work, we systematically conduct parametric studies revealing the sensitivity of the hole injection on the hole accelerator (a hole accelerator is made of the polarization mismatched p-electron blocking layer ...
      • 1
      • 2
      • 3
      • 4
      • 5

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Discover

      AuthorDemir, Hilmi Volkan (42)Nizamoğlu, Sedat (12)Sun, X. W. (9)Erdem, T. (8)Kyaw, Z. (5)Liu W. (5)Tan S.T. (5)Özbay, Ekmel (5)Özel, Tuncay (5)Nizamoglu, S. (4)... View MoreKeywords
      Light emitting diodes (50)
      Nanocrystals (15)Semiconductor quantum dots (13)Color (10)Gallium nitride (8)Lighting (8)Semiconductor quantum wells (8)Energy transfer (7)Efficiency (6)Photoluminescence (6)... View MoreDate Issued2010 - 2019 (32)2000 - 2009 (17)1998 - 1999 (1)Has File(s)Yes (50)

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy