Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification

Zhou Jing; Jiajie Fan; Wei Chen; Jie Liu; Weizi Wu; Yanjian Xiong

doi:10.3788/LOP56.192303

Journals >Laser & Optoelectronics Progress >Volume 56 >Issue 19 >Page 192303 > Article

Laser & Optoelectronics Progress
Vol. 56, Issue 19, 192303 (2019)

Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification

Zhou Jing¹, Jiajie Fan^{1、2、3、*}, Wei Chen^1、2, Jie Liu¹, Weizi Wu¹, and Yanjian Xiong²

Author Affiliations

¹College of Mechanical and Electrical Engineering, Hohai University, Changzhou, Jiangsu 213022, China

²Changzhou Institute of Technology Research for Solid State Lighting, Changzhou, Jiangsu 213161, China

³Department of Microelectronics, EEMCS Faculty, Delft University of Technology, Delft 2628, the Netherlands

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DOI: 10.3788/LOP56.192303 Cite this Article Set citation alerts

Zhou Jing, Jiajie Fan, Wei Chen, Jie Liu, Weizi Wu, Yanjian Xiong. Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification[J]. Laser & Optoelectronics Progress, 2019, 56(19): 192303 Copy Citation Text

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Fig. 1. UV light purification system structure

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Fig. 2. Structural diagram of UV LED array module. (a) 2D structure; (b) 3D structure

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Fig. 3. Luminescence intensity distribution with three illumination angles

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Fig. 4. Influence of LED array on illumination at points A and B. (a) Point A; (b) point B

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Fig. 5. Illumination of LED 1-3 at point A

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Fig. 6. Illumination of LED 1-3 at point B

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Fig. 7. Flowchart for calculating LED distance by the dichotomy method

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Fig. 8. Simulated illumination distribution of UV LED array module when the irritation angle is 120° and illumination ratio of purification layer is 0.6

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Fig. 9. Irradiance measurement setup for UV LED array module

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Fig. 10. Experimental module and measuring points. (a) Picture of UV LED array module; (b) UV irradiance measuring points

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Fig. 11. Simulated illumination distributions of UV LED array module at different distances. (a) 20 mm; (b) 40 mm; (c) 60 mm; (d) 80 mm; (e) 100 mm

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Fig. 12. Comparison of experimental and simulation results of illumination uniformity on each target surface at different distances

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h /mm	2θ_1/2 /(°)	E_B/E_A	d /mm	Arrangement of LEDs(LED module size: 330 mm×330 mm)	Total number of LEDs
20	120	0.6	31.88	11×11	121
		0.75	26.32	13×13	169
		0.9	17.33	19×19	361
	90	0.6	27.41	12×12	144
	60	0.75	23.06	14×14	196
		0.9	15.77	21×21	441
		0.6	20.79	16×16	256
		0.75	18.00	18×18	324
		0.9	13.33	24×24	576

Table 1. LED distances calculated by the dichotomy method

E_B/E_A	Normalized illumination on purificationlayer / LED emission illuminance
E_B/E_A	2θ₁_/₂ =120°	2θ₁_/₂ =90°	2θ₁_/₂ =60°
0.6	0.84	0.93	0.96
0.75	0.86	0.95	0.98
0.9	0.89	0.92	0.98

Table 2. Simulation results of normalized illumination distributions using the TracePro

Package size /(mm×mm)	Peakwavelength /nm	Power(@0.35 A) /W	Opticalpower /W	Thermal resistance /(℃·W^-1)	Beam angle /(°)
3.5×3.5	372	1.26	0.35	6	120

Table 3. Sample parameters of UV LED lamp bead used in this study

Point	Irradiance density /(10² μW·cm^-2)
	h=20 mm		h=40 mm		h=60 mm		h=80 mm		h=100 mm
	V	H	V	H	V	H	V	H	V	H
Point_-7	126.52	173.87	113.96	112.62	69.51	73.08	65.13	64.73	41.69	46.85
Point_-6	179.02	209.76	148.36	144.85	80.24	88.69	78.56	75.15	54.62	58.31
Point_-5	215.79	239.5	181.06	168.42	94.84	102.36	88.39	85.66	63.92	68.54
Point_-4	241.6	247.2	194.87	194.27	110.19	115.82	98.35	95.71	70.03	74.23
Point_-3	242.1	244.2	211.33	204.61	123.11	126.68	105.62	103.61	75.67	79.94
Point_-2	245.4	243.5	217.57	206.87	131.21	133.15	111.59	107.55	79.61	83.83
Point_-1	240.7	237.2	217.92	207.37	137.93	135.02	114.45	109.72	81.89	85.59
Point₀	232.9	230.7	214.02	202.12	139.18	134.69	114.51	108.56	82.87	85.54
Point₁	226.8	231.2	207.57	194.34	137.03	130.16	111.26	104.97	80.42	82.95
Point₂	222.1	217.9	198.69	182.14	131.48	119.56	106.07	98.02	77.53	79.30
Point₃	212.7	200.8	181.14	163.76	121.27	111.21	98.44	90.57	72.78	74.37
Point₄	207.8	184.47	165.52	146.68	108.46	99.67	88.32	79.48	66.97	65.83
Point₅	196.9	156.24	140.83	125.17	95.78	86.06	78.39	69.42	60.43	59.08
Point₆	169.02	129.14	114.52	102.40	82.83	70.02	66.20	59.16	53.83	51.57
Point₇	139.74	-	-	-	70.24	64.52	54.78	50.79	38.91	39.13
Max	245.4	247.2	217.92	207.37	139.18	135.02	114.51	109.72	82.87	85.59
Min	207.8	184.47	165.52	163.76	108.46	99.67	88.32	79.48	66.97	65.83

Table 4. Irradiance density measurement results of target surfaces at different distances

Distance		Uniformity /%	Average uniformity /%
h=20 mm	V	84.70	79.70
	H	74.60
h=40 mm	V	75.90	77.50
	H	79.00
h=60 mm	V	77.90	75.90
	H	73.80
h=80 mm	V	77.10	74.80
	H	72.40
h=100 mm	V	80.80	78.90
	H	76.90

Table 5. Calculated results of irradiance uniformity of target surfaces at different distances

Distance h /mm	Vertical uniformity	Horizontal uniformity	Average uniformity /%
20	0.71/0.91≈0.78	0.74/0.95≈0.78	78
40	0.70/0.92≈0.76	0.74/0.96≈0.77	77
60	0.66/0.90≈0.73	0.71/0.92≈0.77	75
80	0.61/0.85≈0.72	0.59/0.79≈0.75	73
100	0.64/0.86≈0.74	0.59/0.92≈0.64	69

Table 6. Simulated illumination uniformity of target surfaces at different distances

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