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      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 ...
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      Stable and efficient colour enrichment powders of nonpolar nanocrystals in LiCl 

      Erdem, T.; Soran-Erdem Z.; Sharma, V. K.; Keleştemur, Y.; Adam, M.; Gaponik N.; Demir, Hilmi Volkan (Royal Society of Chemistry, 2015)
      In this work, we propose and develop the inorganic salt encapsulation of semiconductor nanocrystal (NC) dispersion in a nonpolar phase to make a highly stable and highly efficient colour converting powder for colour ...
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      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 ...
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      Highly luminescent CB[7]-based conjugated polyrotaxanes embedded into crystalline matrices 

      Erdem, T.; Idris, M.; Demir, Hilmi Volkan; Tuncel, D. (Wiley-VCH Verlag, 2017)
      π-Conjugated polymers suffer from low quantum yields (QYs) due to chain–chain interactions. Furthermore, their emission in solid films is significantly quenched due to aggregation leading further decrease in QY. These are ...
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      Excitation resolved color conversion of CdSe/ZnS core/shell quantum dot solids for hybrid white light emitting diodes 

      Nizamoglu, S.; Demir, Hilmi Volkan (American Institute of Physics, 2009-04-28)
      In this paper, for their use as nanoluminophors on color-conversion white light emitting diodes (LEDs), we present spectrally resolved relative quantum efficiency and relative color (photon) conversion efficiency of CdSe/ZnS ...
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      Critical role of CdSe nanoplatelets in color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes 

      Hasanov N.; Sharma, V. K.; Martinez, P. L. H.; Tan S.T.; Demir, Hilmi Volkan (OSA - The Optical Society, 2016)
      Here we report CdSe nanoplatelets that are incorporated into color-converting CdSe/ZnS nanocrystals for InGaN/GaN light-emitting diodes. The critical role of CdSe nanoplatelets as an exciton donor for the color conversion ...
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      High-stability, high-efficiency organic monoliths made of oligomer nanoparticles wrapped in organic matrix 

      Soran-Erdem Z.; Erdem, T.; Gungor K.; Pennakalathil, J.; Tuncel, D.; Demir, Hilmi Volkan (American Chemical Society, 2016)
      Oligomer nanoparticles (OL NPs) have been considered unsuitable for solid-state lighting due to their low quantum yields and low temperature stability of their emission. Here, we address these problems by forming highly ...
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      Excitonic improvement of colloidal nanocrystals in salt powder matrix for quality lighting and color enrichment 

      Erdem, T.; Soran-Erdem, Z.; Kelestemur, Y.; Gaponik, N.; Demir, Hilmi Volkan (OSA - The Optical Society, 2016)
      Here we report excitonic improvement in color-converting colloidal nanocrystal powders enabled by co-integrating nonpolar greenand red-emitting nanocrystal energy transfer pairs into a single LiCl salt matrix. This leads ...
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      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 ...
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      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 ...
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      Author
      Demir, Hilmi Volkan (42)
      Nizamoğlu, Sedat (12)Sun, X. W. (9)Erdem, T. (8)Tan S.T. (5)Özel, Tuncay (5)Kyaw, Z. (4)Liu W. (4)Nizamoglu, S. (4)Tuncel, D. (4)... View MoreKeywords
      Light emitting diodes (42)
      Nanocrystals (15)Semiconductor quantum dots (13)Color (10)Energy transfer (7)Gallium nitride (7)Lighting (7)Efficiency (6)Semiconductor quantum wells (6)Color conversions (5)... View MoreDate Issued2010 - 2017 (27)2006 - 2009 (15)Has File(s)Yes (42)

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