Research Papers

Reduced Working Temperature of Quantum Dots-Light-Emitting Diodes Optimized by Quantum Dots at Silica-on-Chip Structure

[+] Author and Article Information
Bin Xie, Xingjian Yu, Ruikang Wu

School of Energy and Power Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China

Haochen Liu, Xiao Wei Sun, Kai Wang

Department of Electrical and Electronic
Southern University of Science and Technology,
Shenzhen 518055, China

Xiaobing Luo

School of Energy and Power Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China
e-mail: luoxb@hust.edu.cn

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received September 27, 2018; final manuscript received November 19, 2018; published online April 10, 2019. Assoc. Editor: Changqing Chen.

J. Electron. Packag 141(3), 031001 (Apr 10, 2019) (6 pages) Paper No: EP-18-1080; doi: 10.1115/1.4042981 History: Received September 27, 2018; Revised November 19, 2018

White light-emitting diodes (WLEDs) composed of blue LED chip, yellow phosphor, and red quantum dots (QDs) are considered as a potential alternative for next-generation artificial light source with their high luminous efficiency (LE) and color-rendering index (CRI) while QDs' poor temperature stability and the incompatibility of QDs/silicone severely hinder the wide utilization of QDs-WLEDs. To relieve this, here we proposed a separated QDs@silica nanoparticles (QSNs)/phosphor structure, which composed of a QSNs-on-chip layer with a yellow phosphor layer above. A silica shell was coated onto the QDs surface to solve the compatibility problem between QDs and silicone. With CRI > 92 and R9 > 90, the newly proposed QSNs-based WLEDs present 16.7% higher LE and lower QDs working temperature over conventional mixed type WLEDs. The reduction of QDs' temperature can reach 11.5 °C, 21.3 °C, and 30.3 °C at driving current of 80 mA, 200 mA, and 300 mA, respectively.

Copyright © 2019 by ASME
Your Session has timed out. Please sign back in to continue.


Pimputkar, S. , Speck, J. S. , DenBaars, S. P. , and Nakamura, S. , 2009, “ Prospects for LED Lighting,” Nat. Photonics, 3(4), pp. 180–182. [CrossRef]
Luo, X. , Hu, R. , Liu, S. , and Wang, K. , 2016, “ Heat and Fluid Flow in High-Power LED Packaging and Applications,” Prog. Energy Combust. Sci., 56, pp. 1–32. [CrossRef]
Jang, H. S. , and Jeon, D. Y. , 2007, “ White Light Emission From Blue and Near Ultraviolet Light-Emitting Diodes Precoated With Sr3SiO5: Ce3+, Li+ Phosphor,” Opt. Lett., 32(23), pp. 3444–3446. [CrossRef] [PubMed]
Jang, H. S. , Im, W. B. , Lee, D. C. , Jeon, D. Y. , and Kim, S. S. , 2007, “ Enhancement of Red Spectral Emission Intensity of Y3Al5O12:Ce3+ Phosphor Via Pr Co-Doping and Tb Substitution for the Application to White LEDs,” J. Lumin., 126(2), pp. 371–377. [CrossRef]
Uheda, K. , Hirosaki, N. , and Yamamoto, H. , 2006, “ Host Lattice Materials in the System Ca3N2-AlN-Si3N4 for White Light Emitting Diode,” Phys. Status Solidi A, 203(11), pp. 2712–2717. [CrossRef]
Dhanaraj, J. , Jagannathan, R. , and Trivedi, D. C. , 2003, “ Y2O2S: Eu3+ Nanocrystals-Synthesis and Luminescent Properties,” J. Mater. Chem., 13(7), pp. 1778–1782. [CrossRef]
Cho, K.-S. , Lee, E. K. , Joo, W.-J. , Jang, E. , Kim, T.-H. , Lee, S. J. , Kwon, S.-J. , Han, J. Y. , Kim, B.-K. , Choi, B. L. , and Kim, J. M. , 2009, “ High-Performance Crosslinked Colloidal Quantum-Dot Light-Emitting Diodes,” Nat. Photonics, 3(6), pp. 341–345. [CrossRef]
Xie, B. , Hu, R. , and Luo, X. , 2016, “ Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives,” ASME J. Electron. Packag., 138(2), p. 020803. [CrossRef]
Chen, W. , Wang, K. , Hao, J. , Wu, D. , Qin, J. , Dong, D. , Deng, J. , Li, Y. , Chen, Y. , and Cao, W. , 2016, “ High Efficiency and Color Rendering Quantum Dots White Light Emitting Diodes Optimized by Luminescent Microspheres Incorporating,” Nanophotonics, 5(4), pp. 565–572.
Xie, B. , Zhang, J. , Chen, W. , Hao, J. , Cheng, Y. , Hu, R. , Wu, D. , Wang, K. , and Luo, X. , 2017, “ Realization of Wide Circadian Variability by Quantum Dots-Luminescent Mesoporous Silica-Based White Light-Emitting Diodes,” Nanotechnology, 28(42), p. 425204. [CrossRef] [PubMed]
Kim, H. , Jang, H. S. , Kwon, B. H. , Suh, M. , Kim, Y. , Cheong, S. H. , and Jeon, D. Y. , 2011, “ In Situ Synthesis of Thiol-Capped CuInS2-ZnS Quantum Dots Embedded In Silica Powder by Sequential Ligand-Exchange and Silanization,” Electronchem. Solid-State Lett., 15(2), pp. K16–K18. [CrossRef]
Tamborra, M. , Striccoli, M. , Comparelli, R. , Curri, M. L. , Petrella, A. , and Agostiano, A. , 2004, “ Optical Properties of Hybrid Composites Based on Highly Luminescent CdS Nanocrystals in Polymer,” Nanotechnology, 15(4), pp. S240–S244. [CrossRef]
Zhang, H. , Cui, Z. , Wang, Y. , Zhang, K. , Ji, X. , Lu, C. , Yang, B. , and Gao, M. , 2003, “ From Water-Soluble CdTe Nanocrystals to Fluorescent Nanocrystal-Polymer Transparent Composites Using Polymerizable Surfactants,” Adv. Mater., 15(10), pp. 777–780. [CrossRef]
Chen, W. , Wang, K. , Hao, J. , Wu, D. , Wang, S. , Qin, J. , Li, C. , and Cao, W. , 2015, “ Highly Efficient and Stable Luminescence From Microbeans Integrated With Cd-Free Quantum Dots for White-Light-Emitting Diodes,” Part. Part. Syst. Charact., 32(10), pp. 922–927. [CrossRef]
Zhao, B. , Yao, X. , Gao, M. , Sun, K. , Zhang, J. , and Li, W. , 2015, “ Doped Quantum Dots@Silica Nanocomposites for White Light-Emitting Diodes,” Nanoscale, 7(41), pp. 17231–17236. [CrossRef] [PubMed]
Zhou, C. , Shen, H. , Wang, H. , Xu, W. , Mao, M. , Wang, S. , and Li, L. S. , 2012, “ Synthesis of Silica Protected Photoluminescence QDs and Their Application for Transparent Fluorescent Films With Enhanced Photochemical Stability,” Nanotechnology, 23(42), p. 425601. [CrossRef] [PubMed]
Hao, J. , Zhou, J. , and Zhang, C. , 2013, “ A Tri-n-Octylphosphine-Assisted Successive Ionic Layer Adsorption and Reaction Method to Synthesize Multilayered Core-Shell CdSe-ZnS Quantum Dots With Extremely High Quantum Yield,” Chem. Comm., 49(56), pp. 6346–6348. [CrossRef]
Li, H. , Wu, K. , Lim, J. , Song, H. J. , and Klimov, V. I. , 2016, “ Doctor-Blade Deposition of Quantum Dots Onto Standard Window Glass for Low-Loss Large-Area Luminescent Solar Concentrators,” Nat. Energy, 1, p. 16157. [CrossRef]
Xie, B. , Chen, W. , Hao, J. , Wu, D. , Yu, X. , Chen, Y. , Hu, R. , Wang, K. , and Luo, X. , 2016, “ Structural Optimization for Remote White Light-Emitting Diodes With Quantum Dots and Phosphor: Packaging Sequence Matters,” Opt. Express, 24(26), pp. A1560–A1570. [CrossRef] [PubMed]
Şahin, D. , Ilan, B. , and Kelley, D. F. , 2011, “ Monte Carlo Simulations of Light Propagation in Luminescent Solar Concentrators Based on Semiconductor Nanoparticles,” J. Appl. Phys., 110(3), p. 033108. [CrossRef]
Xie, B. , Liu, H. , Hu, R. , Wang, C. , Hao, J. , Wang, K. , and Luo, X. , 2018, “ Targeting Cooling for Quantum Dots in White QDs-LEDs by Hexagonal Boron Nitride Platelets With Electrostatic Bonding,” Adv. Funct. Mater., 28(30), p. 1801407. [CrossRef]
Ma, Y. , Lan, W. , Xie, B. , Hu, R. , and Luo, X. , 2018, “ An Optical-Thermal Model for Laser-Excited Remote Phosphor with Thermal Quenching,” Int. J. Heat Mass Transfer, 116, pp. 694–702. [CrossRef]
Xie, H. , Fujii, M. , and Zhang, X. , 2005, “ Effect of Interfacial Nanolayer on the Effective Thermal Conductivity of Nanoparticle-Fluid Mixture,” Int. J. Heat Mass Transfer, 48(14), pp. 2926–2932. [CrossRef]
Hu, R. , Luo, X. , and Zheng, H. , 2012, “ Hotspot Location Shift in the High-Power Phosphor-Converted White Light-Emitting Diode Packages,” Jpn. J. Appl. Phys., 51(9S2), p. 09MK05. [CrossRef]
Orloff, L. , De Ris, J. , and Markstein, G. H. , 1975, “ Upward Turbulent Fire Spread and Burning of Fuel Surface,” Proc. Combust. Inst., 15(1), pp. 183–192. [CrossRef]


Grahic Jump Location
Fig. 1

Schematic of the (a) QSNs-on-chip and (b) mixed type WLEDs. (a) QSNs-on-chip and (b) QSNs/phosphor mixed.

Grahic Jump Location
Fig. 2

Schematic of the silica coating process

Grahic Jump Location
Fig. 3

Schematic showing the heat generation measuring processes

Grahic Jump Location
Fig. 4

Finite element models setup of (a) QSNs-on-chip and (b) mixed type WLEDs. The insets show the corresponding photographs of the WLEDs under daylight and ultraviolet (UV) light. (a) Type I: QSNs-on-chip and (b) type II: QSNs/phosphor mixed.

Grahic Jump Location
Fig. 5

High-resolution transmission electron microscopy images of the CdSe/ZnS QDs (a) and the QSNs (b), insets show the corresponding photographs under daylight and UV light. (c) Absorption and PL spectra of the CdSe core QDs and CdSe/ZnS core–shell QDs.

Grahic Jump Location
Fig. 6

(a) Electroluminescence spectra of the as-fabricated WLEDs under driving current of 20 mA, insets show their illuminated photographs. (b) Heat generation of each component under different driving current.

Grahic Jump Location
Fig. 7

Simulated steady-state temperature fields of two WLEDs under driving current of 80 mA, 200 mA, and 300 mA. (a) Mixed at 80 mA, (b) mixed at 200 mA, (c) mixed at 300 mA, (d) QSNs on-chip at 80 mA, (e) QSNs on-chip at 200 mA, and (f) QSNs on-chip at 300 mA.

Grahic Jump Location
Fig. 8

Temperature fields of two WLEDs under driving current of (a) 80 mA, (b) 200 mA, and (c) 300 mA



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In