Tunable White Fluorescent Copper Gallium Sulfide Quantum Dots Enabled by Mn Doping.
Fluorescence of semiconductor quantum dots (QDs) can be tuned by engineering the band gap via size and composition control and further doping them with impurity ions. Targeting on highly bright white-emissive I-III-VI -type copper gallium sulfide (Cu-Ga-S, CGS) host QDs with the entire visible spectral coverage of blue to red, herein, Mn(2+) ion doping, through surface adsorption and lattice diffusion is fulfilled. Upon doping a distinct Mn emission from (4)T1-(6)A1 transition successfully appears in white photoluminescence (PL) of undoped CGS/ZnS core/shell QDs and with varying Mn concentration a systematic white spectral evolution of CGS:Mn/ZnS QDs is achievable with high PL quantum yield retained. The origins of white PL of CGS:Mn/ZnS QDs that is well decomposed into three emission bands are appropriately assigned. The resulting single-phased, doped QDs are then employed as near-UV-to-white down converters for the fabrication of white light-emitting diodes (LEDs). Electroluminescent properties of white QD-LEDs depending on Mn concentration of CGS:Mn/ZnS QDs and forward current are also discussed in detail.
Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea.
Dae-Yeon
DY
Jo
Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea.
Daekyoung
D
Kim
Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea.
Jong-Hoon
JH
Kim
Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU) , Suwon 440-746, Korea.
Heeyeop
H
Chae
Department of Physics, Pukyong National University , Busan 608-737, Korea.
Hyo Jin
HJ
Seo
Department of Chemistry, Kookmin University , Seoul 136-702, Korea.
Young Rag
YR
Do
Department of Materials Science and Engineering, Hongik University , Seoul 121-791, Korea.
Heesun
H
Yang
Mn doping; copper gallium sulfide; down converters; single-phased quantum dots; white lighting devices; white photoluminescence