TY - GEN
T1 - White light emission from blue InGaN LED with hybrid phosphor
AU - Yu, Hong Jeong
AU - Chung, Wonkeun
AU - Kim, Sung Hyun
PY - 2010
Y1 - 2010
N2 - In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer / QDs composite (green-emitting Poly [(9,9-dioctyl-2,7- divinylenefluorenylene)-alto-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene] / red-emitting CdSe quantum dots) as hybrid phosphor. The emission peak wavelengths of blue, green and red emissions in spectra are 462 and 618 nm respectively. Green-emitting polymer has two emission peaks (515 and 543nm). The subpeak of polymer (515 nm) is covered by absorption of QDs. Therefore the emission of first peak is decreasing as increasing the ratio of QDs while the emission of QD (618 nm) is increasing. Therefore CIE-1931 coordinate, the color temperature (Tc) and the color rendering index (Ra) were changed by the different ratio of QDs to copolymer. The white LED of the hybrid phosphor containing 20 wt% QDs has a luminous efficiency of 44.2 lm/W at 20 mA with a CIE-1931 coordinate of (0.3297, 0.3332), Tc of 5620 K and Ra of 75.3.
AB - In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer / QDs composite (green-emitting Poly [(9,9-dioctyl-2,7- divinylenefluorenylene)-alto-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene] / red-emitting CdSe quantum dots) as hybrid phosphor. The emission peak wavelengths of blue, green and red emissions in spectra are 462 and 618 nm respectively. Green-emitting polymer has two emission peaks (515 and 543nm). The subpeak of polymer (515 nm) is covered by absorption of QDs. Therefore the emission of first peak is decreasing as increasing the ratio of QDs while the emission of QD (618 nm) is increasing. Therefore CIE-1931 coordinate, the color temperature (Tc) and the color rendering index (Ra) were changed by the different ratio of QDs to copolymer. The white LED of the hybrid phosphor containing 20 wt% QDs has a luminous efficiency of 44.2 lm/W at 20 mA with a CIE-1931 coordinate of (0.3297, 0.3332), Tc of 5620 K and Ra of 75.3.
UR - https://www.scopus.com/pages/publications/79951823556
UR - https://www.scopus.com/pages/publications/79951823556#tab=citedBy
U2 - 10.1109/NANO.2010.5697998
DO - 10.1109/NANO.2010.5697998
M3 - Conference contribution
AN - SCOPUS:79951823556
SN - 9781424470334
T3 - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
SP - 958
EP - 961
BT - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
T2 - 2010 10th IEEE Conference on Nanotechnology, NANO 2010
Y2 - 17 August 2010 through 20 August 2010
ER -