Hybrid white light sources based on layer-by-layer assembly of nanocrystals on near-UV emitting diodes

被引:44
作者
Nizamoglu, Sedat [1 ]
Demir, Hilmi Volkan
机构
[1] Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey
[2] Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey
[3] Bilkent Univ, Nanotechnol Res Ctr, TR-06800 Ankara, Turkey
关键词
D O I
10.1088/0957-4484/18/40/405702
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We present the design, growth, fabrication, integration and characterization of alternative hybrid white light sources based on the controlled layer-by-layer assembly of nanocrystals on UV-emitting nitride diodes for adjustable white light parameters. We hybridize CdSe/ZnS core-shell nanocrystals of different sizes (1.9-3.2- 5.2 nm) on InGaN/GaN LEDs as a near-UV excitation source at 383 nm for efficient pumping. The first device includes layer-by-layer assembly of dichromatic cyan-and red-emitting nanocrystals (lambda(PL) = 504 - 615 nm) leading to the tristimulus coordinates ( x = 0.37, y = 0.46); the second device uses the trichromatic combination of layer-by-layer hybridized cyan-, yellow- and red-emitting nanocrystals (lambda(PL) = 504 - 580 - 615 nm), yielding ( x = 0.38, y = 0.48). Such layer-by-layer hybridization offers the advantages of precisely controlling individual nanocrystal film thicknesses and order in addition to concentrations. By utilizing such multiple combinations of nanocrystals in the assembly, the light parameters are well controlled and adjusted. Leveraging rapidly advancing UV technology into efficient lighting with nanocrystal based color conversion, it is critical to develop and demonstrate hybrid light sources on UV pumping platforms.
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页数:4
相关论文
共 16 条
[11]  
NIZAMOGLU S, 2006, IEEE COMMAND C OPT M
[12]   Optically controlled electroabsorption modulators for unconstrained wavelength conversion [J].
Sabnis, VA ;
Demir, HV ;
Fidaner, O ;
Harris, JS ;
Miller, DAB ;
Zheng, JF ;
Li, N ;
Wu, TC ;
Chen, HT ;
Houng, YM .
APPLIED PHYSICS LETTERS, 2004, 84 (04) :469-471
[13]   The future of ultraviolet LEDs [J].
Sandhu, Adarsh .
NATURE PHOTONICS, 2007, 1 (01) :38-38
[14]   Blue quantum electroabsorption modulators based on reversed quantum confined Stark effect with blueshift [J].
Sari, Emre ;
Nizamoglu, Sedat ;
Ozel, Tuncay ;
Demir, Hilmi Volkan .
APPLIED PHYSICS LETTERS, 2007, 90 (01)
[15]   Highly luminescent monodisperse CdSe and CdSe/ZnS nanocrystals synthesized in a hexadecylamine-trioctylphosphine oxide-trioctylphospine mixture [J].
Talapin, DV ;
Rogach, AL ;
Kornowski, A ;
Haase, M ;
Weller, H .
NANO LETTERS, 2001, 1 (04) :207-211
[16]   A methodological study of the best solution for generating white light using nitride-based light-emitting diodes [J].
Yamada, M ;
Narukawa, Y ;
Tamaki, H ;
Murazaki, Y ;
Mukai, T .
IEICE TRANSACTIONS ON ELECTRONICS, 2005, E88C (09) :1860-1871