Multi-color-emitting quantum dot-based white LEDs

Xiaoqin Gao; Jian Dang; Liang Wu; Bin Sheng; Jiayu Zhang; Zaichen Zhang

doi:10.3788/COL201614.112301

Journals >Chinese Optics Letters >Volume 14 >Issue 11 >Page 112301 > Article

Chinese Optics Letters
Vol. 14, Issue 11, 112301 (2016)

Multi-color-emitting quantum dot-based white LEDs

Xiaoqin Gao¹, Jian Dang¹, Liang Wu¹, Bin Sheng¹, Jiayu Zhang², and Zaichen Zhang^1、*

Author Affiliations

¹National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

²School of Electronic Science and Engineering, Advanced Photonics Center, Southeast University, Nanjing 210096, China

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DOI: 10.3788/COL201614.112301 Cite this Article Set citation alerts

Xiaoqin Gao, Jian Dang, Liang Wu, Bin Sheng, Jiayu Zhang, Zaichen Zhang. Multi-color-emitting quantum dot-based white LEDs[J]. Chinese Optics Letters, 2016, 14(11): 112301 Copy Citation Text

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Abstract

Research on white light-emitting diodes (LEDs) based on multi-color-emitting quantum dots (QDs) is carried out in this Letter. The equations of luminous efficiency (LE), color rendering index (CRI), chromaticity coordinates

(x, y)

, and color temperature (

T_{c}

) of white LEDs are obtained, according to the spectral-LE function

Φ

of LED chips and QDs. The calculated results indicate that the values of the performance parameters of QD-based white LEDs are closely related and proportional to the QDs’ fluorescence spectra, and white LEDs with a high LE and a high CRI may be fabricated based on QDs. We have provided theoretical guidance for preparing such white LEDs.

Φ_{LED} = K_{m} \cdot \int P_{LED} (λ) V (λ) d λ,

(1a)

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Φ_{QD} = K_{m} \cdot \int P_{QD} (λ) V (λ) d λ,

(1b)

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L = \frac{η_{LED}}{1 - β_{1} - β_{2} + \frac{λ_{QD 1}}{λ_{LED}} \cdot \frac{β_{1}}{η_{QD 1}} + \frac{λ_{QD 2}}{λ_{LED}} \cdot \frac{β_{2}}{η_{QD 2}}} \times [(1 - β_{1} - β_{2}) \cdot Φ_{LED} + β_{1} \cdot Φ_{QD 1} + β_{2} \cdot Φ_{QD 2}],

(2)

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X = \int X (λ) P (λ) d λ,

(3a)

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Y = \int Y (λ) P (λ) d λ,

(3b)

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Z = \int Z (λ) P (λ) d λ,

(3c)

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L = \frac{η_{LED}}{1 - \sum_{i = 1}^{i = N} β_{i} + \sum_{i = 1}^{i = N} \frac{λ_{QD i}}{λ_{LED}} \cdot \frac{β_{i}}{η_{QD i}}} \times [(1 - \sum_{i = 1}^{i = N} β_{i}) \cdot Φ_{LED} + \sum_{i = 1}^{i = N} β_{i} \cdot Φ_{QD i}],

(4)

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R a = \frac{1}{8} \sum_{i = 1}^{i = 8} R_{i},

(5)

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A = \frac{x - x_{0}}{y - y_{0}} = \frac{x - 0.329}{y - 0.187},

(6a)

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T_{c} = 669 A^{4} - 779 A^{3} + 3660 A^{2} - 7047 A + 5652,

(6b)

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Xiaoqin Gao, Jian Dang, Liang Wu, Bin Sheng, Jiayu Zhang, Zaichen Zhang. Multi-color-emitting quantum dot-based white LEDs[J]. Chinese Optics Letters, 2016, 14(11): 112301

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