An efficient and stable fluorescent graphene quantum dot-agar composite as a converting material in white light emitting diodes

被引：160

作者：

Luk, C. M. ^{[1
]}

Tang, L. B. ^{[1
]}

Zhang, W. F. ^{[1
]}

Yu, S. F. ^{[1
]}

Teng, K. S. ^{[2
]}

Lau, S. P. ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China

[2] Univ Swansea, Multidisciplinary Ctr, Coll Engn, Swansea SA2 8PP, W Glam, Wales

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 42期

关键词：

PHOTOLUMINESCENCE; LEDS; NANOCRYSTALS;

D O I：

10.1039/c2jm35305a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphene quantum dots (GQDs) have attracted great attention due to their unique optoelectronic properties. There remains a critical challenge to utilize the water-soluble GQDs for device applications. Here we report a facile method to fabricate a GQD-agar composite. The composite exhibits excellent optical stability and no luminescence quenching is observed. The composite is successfully applied as a colour converting material in blue light-emitting diodes (LEDs) to achieve white light emission. The luminous efficiency and light conversion efficiency of the white LED are 42.2 lm W-1 and 61.1% respectively. The light conversion efficiency of the WLED is stable for over 100 hours of continuous operation.

引用

页码：22378 / 22381

页数：4

共 30 条

[1] Insights into few-layer epitaxial graphene growth on 4H-SiC(000(1)over-bar substrates from STM studies [J].

Biedermann, Laura B. ;

Bolen, Michael L. ;

Capano, Michael A. ;

Zemlyanov, Dmitry ;

Reifenberger, Ronald G. .

PHYSICAL REVIEW B, 2009, 79 (12)

[2] Photoluminescent carbogenic dots [J].

Bourlinos, Athanasios B. ;

Stassinopoulos, Andreas ;

Anglos, Demetrios ;

Zboril, Radek ;

Georgakilas, Vasilios ;

Giannelis, Emmanuel P. .

CHEMISTRY OF MATERIALS, 2008, 20 (14) :4539-4541

[3] Surface functionalized carbogenic quantum dots [J].

Bourlinos, Athanasios B. ;

Stassinopoulos, Andreas ;

Anglos, Demetrios ;

Zboril, Radek ;

Karakassides, Michael ;

Giannelis, Emmanuel P. .

SMALL, 2008, 4 (04) :455-458

[4] InGaN-CdSe-ZnSe quantum dots white LEDs [J].

Chen, HS ;

Hsu, CK ;

Hong, HY .

IEEE PHOTONICS TECHNOLOGY LETTERS, 2006, 18 (1-4) :193-195

[5] Blue Photoluminescence from Chemically Derived Graphene Oxide [J].

Eda, Goki ;

Lin, Yun-Yue ;

Mattevi, Cecilia ;

Yamaguchi, Hisato ;

Chen, Hsin-An ;

Chen, I-Sheng ;

Chen, Chun-Wei ;

Chhowalla, Manish .

ADVANCED MATERIALS, 2010, 22 (04) :505-+

[6] Group IV Nanoparticles: Synthesis, Properties, and Biological Applications [J].

Fan, Jiyang ;

Chu, Paul K. .

SMALL, 2010, 6 (19) :2080-2098

[7] Electric-field controlled spin in bilayer triangular graphene quantum dots [J].

Gueclue, A. D. ;

Potasz, P. ;

Hawrylak, P. .

PHYSICAL REVIEW B, 2011, 84 (03)

[8] White-Light-Emitting Diodes with Quantum Dot Color Converters for Display Backlights [J].

Jang, Eunjoo ;

Jun, Shinae ;

Jang, Hyosook ;

Llim, Jungeun ;

Kim, Byungki ;

Kim, Younghwan .

ADVANCED MATERIALS, 2010, 22 (28) :3076-3080

[9] White light-emitting diodes with excellent color rendering based on organically capped CdSe quantum dots and Sr3SiO5:Ce3+, Li+ phosphors [J].

Jang, Ho Seong ;

Yang, Heesun ;

Kim, Sung Wook ;

Han, Ji Yeon ;

Lee, Sang-Geun ;

Jeon, Duk Young .

ADVANCED MATERIALS, 2008, 20 (14) :2696-+

[10] Water-Soluble Fluorescent Carbon Quantum Dots and Photocatalyst Design [J].

Li, Haitao ;

He, Xiaodie ;

Kang, Zhenhui ;

Huang, Hui ;

Liu, Yang ;

Liu, Jinglin ;

Lian, Suoyuan ;

Tsang, Chi Him A. ;

Yang, Xiaobao ;

Lee, Shuit-Tong .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2010, 49 (26) :4430-4434

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