White light emission from blue InGaN LED precoated with conjugated copolymer/quantum dots as hybrid phosphor

Hong Jeong Yu; Kwanhwi Park; Wonkeun Chung; Jihyun Kim; Sung Hyun Kim

doi:10.1016/j.synthmet.2009.08.013

White light emission from blue InGaN LED precoated with conjugated copolymer/quantum dots as hybrid phosphor

Hong Jeong Yu, Kwanhwi Park, Wonkeun Chung, Jihyun Kim, Sung Hyun Kim

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer/quantum dots (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 a hybrid phosphor. The emission peak wavelengths of the blue and red emissions in the spectra were 462 and 618 nm, respectively. The green-emitting polymer had two emission peaks at 515 and 543 nm. The subpeak of the copolymer (515 nm) was decreased by the absorption of QDs as the ratio of QDs increased, while the emission of the QD (618 nm) increased. Therefore, changes in the CIE-1931 coordinate, color temperature (Tc) and color-rendering index (Ra) were dependent on the QDs to copolymer ratios. The white LED of the hybrid phosphor containing 20 wt.% QDs had a luminous efficiency of 44.2 l m/W at 20 mA with a CIE-1931 coordinate, Tc and Ra of (0.3297, 0.3332), 5620 K and 75.3, respectively.

Original language	English
Pages (from-to)	2474-2477
Number of pages	4
Journal	Synthetic Metals
Volume	159
Issue number	23-24
DOIs	https://doi.org/10.1016/j.synthmet.2009.08.013
Publication status	Published - 2009 Dec

Bibliographical note

Funding Information:
The authors are grateful for financial support for this work from the Carbon Dioxide Reduction and Sequestration Center, a 21st Century Frontier R&D Program funded by the Ministry of Science and Technology of Korea .

Keywords

Phosphors
Polyfluorene
Quantum dot
White light emitting diodes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.synthmet.2009.08.013

Cite this

@article{7572352b7d3a4a0fa05ae4691a88e04e,

title = "White light emission from blue InGaN LED precoated with conjugated copolymer/quantum dots as hybrid phosphor",

abstract = "In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer/quantum dots (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 a hybrid phosphor. The emission peak wavelengths of the blue and red emissions in the spectra were 462 and 618 nm, respectively. The green-emitting polymer had two emission peaks at 515 and 543 nm. The subpeak of the copolymer (515 nm) was decreased by the absorption of QDs as the ratio of QDs increased, while the emission of the QD (618 nm) increased. Therefore, changes in the CIE-1931 coordinate, color temperature (Tc) and color-rendering index (Ra) were dependent on the QDs to copolymer ratios. The white LED of the hybrid phosphor containing 20 wt.% QDs had a luminous efficiency of 44.2 l m/W at 20 mA with a CIE-1931 coordinate, Tc and Ra of (0.3297, 0.3332), 5620 K and 75.3, respectively.",

keywords = "Phosphors, Polyfluorene, Quantum dot, White light emitting diodes",

author = "Yu, {Hong Jeong} and Kwanhwi Park and Wonkeun Chung and Jihyun Kim and Kim, {Sung Hyun}",

note = "Funding Information: The authors are grateful for financial support for this work from the Carbon Dioxide Reduction and Sequestration Center, a 21st Century Frontier R&D Program funded by the Ministry of Science and Technology of Korea .",

year = "2009",

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doi = "10.1016/j.synthmet.2009.08.013",

language = "English",

volume = "159",

pages = "2474--2477",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - White light emission from blue InGaN LED precoated with conjugated copolymer/quantum dots as hybrid phosphor

AU - Yu, Hong Jeong

AU - Park, Kwanhwi

AU - Chung, Wonkeun

AU - Kim, Jihyun

AU - Kim, Sung Hyun

N1 - Funding Information: The authors are grateful for financial support for this work from the Carbon Dioxide Reduction and Sequestration Center, a 21st Century Frontier R&D Program funded by the Ministry of Science and Technology of Korea .

PY - 2009/12

Y1 - 2009/12

N2 - In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer/quantum dots (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 a hybrid phosphor. The emission peak wavelengths of the blue and red emissions in the spectra were 462 and 618 nm, respectively. The green-emitting polymer had two emission peaks at 515 and 543 nm. The subpeak of the copolymer (515 nm) was decreased by the absorption of QDs as the ratio of QDs increased, while the emission of the QD (618 nm) increased. Therefore, changes in the CIE-1931 coordinate, color temperature (Tc) and color-rendering index (Ra) were dependent on the QDs to copolymer ratios. The white LED of the hybrid phosphor containing 20 wt.% QDs had a luminous efficiency of 44.2 l m/W at 20 mA with a CIE-1931 coordinate, Tc and Ra of (0.3297, 0.3332), 5620 K and 75.3, respectively.

AB - In this work we fabricated white LEDs using a blue InGaN LED precoated conjugated copolymer/quantum dots (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 a hybrid phosphor. The emission peak wavelengths of the blue and red emissions in the spectra were 462 and 618 nm, respectively. The green-emitting polymer had two emission peaks at 515 and 543 nm. The subpeak of the copolymer (515 nm) was decreased by the absorption of QDs as the ratio of QDs increased, while the emission of the QD (618 nm) increased. Therefore, changes in the CIE-1931 coordinate, color temperature (Tc) and color-rendering index (Ra) were dependent on the QDs to copolymer ratios. The white LED of the hybrid phosphor containing 20 wt.% QDs had a luminous efficiency of 44.2 l m/W at 20 mA with a CIE-1931 coordinate, Tc and Ra of (0.3297, 0.3332), 5620 K and 75.3, respectively.

KW - Phosphors

KW - Polyfluorene

KW - Quantum dot

KW - White light emitting diodes

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DO - 10.1016/j.synthmet.2009.08.013

M3 - Article

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VL - 159

SP - 2474

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JO - Synthetic Metals

JF - Synthetic Metals

IS - 23-24

ER -

White light emission from blue InGaN LED precoated with conjugated copolymer/quantum dots as hybrid phosphor

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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