Simultaneously improve the luminous efficiency and color-rendering index of GaN-based white-light-emitting diodes using metal localized surface plasmon resonance

Rongqiao Wan; Shuo Zhang; Zhiqiang Liu; Xiaoyan Yi; Liancheng Wang; Junxi Wang; Junhui Li; Wenhui Zhu; Jinmin Li

doi:10.1364/OL.44.004155

Optics Letters
Vol. 44,
Issue 17,
pp. 4155-4158
(2019)
•https://doi.org/10.1364/OL.44.004155

Simultaneously improve the luminous efficiency and color-rendering index of GaN-based white-light-emitting diodes using metal localized surface plasmon resonance

Rongqiao Wan, Shuo Zhang, Zhiqiang Liu, Xiaoyan Yi, Liancheng Wang, Junxi Wang, Junhui Li, Wenhui Zhu, and Jinmin Li

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Rongqiao Wan, Shuo Zhang, Zhiqiang Liu, Xiaoyan Yi, Liancheng Wang, Junxi Wang, Junhui Li, Wenhui Zhu, and Jinmin Li, "Simultaneously improve the luminous efficiency and color-rendering index of GaN-based white-light-emitting diodes using metal localized surface plasmon resonance," Opt. Lett. 44, 4155-4158 (2019)

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Abstract

With the penetration of semiconductor lighting, GaN-based white-light-emitting diodes (WLEDs) with a high color-rendering index (CRI) and simultaneous high luminous efficiency (LE) are required, especially for high-quality indoor lighting. Here, by adopting metal nanoparticles (Ag and Au NPs) into hybridized color conversion material composed of broadband LuAG:Ce phosphor and narrowband CdSe/ZnS red quantum dots, we have fabricated AgAu-WLEDs with simultaneously increased LE (12% increment at $40 A / {cm}^{2}$ ) and CRI (maximum of 94.5), and decreased correlated color temperature (CCT, from $CCT = 6000 K$ to = 4800 K), compared with WLEDs without metal NPs. This improved performance of WLEDs is ascribed to increased color conversion efficiency brought from localized surface plasmon resonance and thus a strong resonant light scattering effect from the incorporated metal NPs. We believe the approach reported in this work will find its application in GaN WLEDs, thus advancing the development of high-efficiency and quality semiconductor lighting.

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Sample	Current Density	CRI	CCT (K)	LE (lm/W)
0 ppm Ag-WLED	$4 A / {cm}^{2}$	89	5800	81
0 ppm Ag-WLED	$40 A / {cm}^{2}$	90.8	6000	61
1 ppm Ag-WLED	$4 A / {cm}^{2}$	90	5500	82
1 ppm Ag-WLED	$40 A / {cm}^{2}$	92	5700	61
3 ppm Ag-WLED	$4 A / {cm}^{2}$	93	5100	87
3 ppm Ag-WLED	$40 A / {cm}^{2}$	91	5200	66
5 ppm Ag-WLED	$4 A / {cm}^{2}$	93.6	5230	86
5 ppm Ag-WLED	$40 A / {cm}^{2}$	92.6	5450	64

Sample	Current Density	CRI	CCT (K)	LE (lm/W)
3 ppm Ag 0 ppm Au-WLED	$4 A / {cm}^{2}$	93	5100	87
3 ppm Ag 0 ppm Au-WLED	$40 A / {cm}^{2}$	91	5200	66
3 ppm Ag 0.5 ppm Au-WLED	$4 A / {cm}^{2}$	92	4750	89
3 ppm Ag 0.5 ppm Au-WLED	$40 A / {cm}^{2}$	89	4880	67
3 ppm Ag 1 ppm Au-WLED	$4 A / {cm}^{2}$	93.2	5070	92
3 ppm Ag 1 ppm Au-WLED	$40 A / {cm}^{2}$	92	5200	68
3 ppm Ag 1.5 ppm Au-WLED	$4 A / {cm}^{2}$	86	4950	92.5
3 ppm Ag 1.5 ppm Au-WLED	$40 A / {cm}^{2}$	84.3	5010	69.5

Sample	Current Density	CRI	CCT (K)	LE (lm/W)
0 ppm Ag-WLED	$4 A / {cm}^{2}$	89	5800	81
0 ppm Ag-WLED	$40 A / {cm}^{2}$	90.8	6000	61
1 ppm Ag-WLED	$4 A / {cm}^{2}$	90	5500	82
1 ppm Ag-WLED	$40 A / {cm}^{2}$	92	5700	61
3 ppm Ag-WLED	$4 A / {cm}^{2}$	93	5100	87
3 ppm Ag-WLED	$40 A / {cm}^{2}$	91	5200	66
5 ppm Ag-WLED	$4 A / {cm}^{2}$	93.6	5230	86
5 ppm Ag-WLED	$40 A / {cm}^{2}$	92.6	5450	64

Sample	Current Density	CRI	CCT (K)	LE (lm/W)
3 ppm Ag 0 ppm Au-WLED	$4 A / {cm}^{2}$	93	5100	87
3 ppm Ag 0 ppm Au-WLED	$40 A / {cm}^{2}$	91	5200	66
3 ppm Ag 0.5 ppm Au-WLED	$4 A / {cm}^{2}$	92	4750	89
3 ppm Ag 0.5 ppm Au-WLED	$40 A / {cm}^{2}$	89	4880	67
3 ppm Ag 1 ppm Au-WLED	$4 A / {cm}^{2}$	93.2	5070	92
3 ppm Ag 1 ppm Au-WLED	$40 A / {cm}^{2}$	92	5200	68
3 ppm Ag 1.5 ppm Au-WLED	$4 A / {cm}^{2}$	86	4950	92.5
3 ppm Ag 1.5 ppm Au-WLED	$40 A / {cm}^{2}$	84.3	5010	69.5

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Optics Letters