Optical properties of broadband reflection of cholesteric liquid crystal by thermal diffusion of benzotriazoles

Rui Han; Ping Gan; Xuetao Zhang; Weiting Shi; Hui Li; Hui Cao; Huihui Wang; Huihui Wang; Dong Wang; Zhou Yang; Wanli He

doi:10.1364/AO.458594

Applied Optics
Vol. 61,
Issue 15,
pp. 4486-4493
(2022)
•https://doi.org/10.1364/AO.458594

Optical properties of broadband reflection of cholesteric liquid crystal by thermal diffusion of benzotriazoles

Rui Han, Ping Gan, Xuetao Zhang, Weiting Shi, Hui Li, Hui Cao, Huihui Wang, Dong Wang, Zhou Yang, and Wanli He

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Rui Han, Ping Gan, Xuetao Zhang, Weiting Shi, Hui Li, Hui Cao, Huihui Wang, Dong Wang, Zhou Yang, and Wanli He, "Optical properties of broadband reflection of cholesteric liquid crystal by thermal diffusion of benzotriazoles," Appl. Opt. 61, 4486-4493 (2022)

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Abstract

Polymer stabilized cholesteric liquid crystal broadband reflective films are prepared by the thermal diffusion of a benzotriazoles organic ultraviolet (UV) absorber (UV-327) combined with photopolymerization. A gradient of UV intensity is established in the direction of film thickness, inducing the formation of a pitch gradient distribution, thus broadening the reflected bandwidth. The effects of UV-327 concentration, UV irradiation intensity, irradiation time, polymerization temperature, and C6M concentration on the reflected bandwidth of the sample are examined in detail. The results indicate that the diffusion method of the organic UV absorber enables the reflected bandwidth to be broadened under appropriate conditions.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Sample Number	SLC-1717 (wt.%)	C6M (wt.%)	R811 (wt.%)	IRG651 (wt.%)
Bn	79.9	9.8	9.8	0.5
Bm	79.9	9.8	9.8	0.5
Bt	79.9	9.8	9.8	0.5
Bw	79.9	9.8	9.8	0.5
Bq1	85.9	3.8	9.8	0.5
Bq2	83.9	5.8	9.8	0.5
Bq3	81.9	7.8	9.8	0.5
Bq4	79.9	9.8	9.8	0.5
Bq5	77.9	11.8	9.8	0.5
Bq6	75.9	13.8	9.8	0.5

Sample Number	365 nm UV Irradiation Intensity ( $m W / c m^{2}$ )	Irradiation Time (min)	Polymerization Temperature (°C)	Mass Fraction of UV-327 in the Films (wt.%)
Bn1	0.2	60	40	0.25
Bn2	0.2	60	40	0.5
Bn3	0.2	60	40	0.75
Bn4	0.2	60	40	1
Bn5	0.2	60	40	1.5
Bm1	0.1	60	40	1
Bm2	0.2	60	40	1
Bm3	0.4	60	40	1
Bm4	0.8	60	40	1
Bm5	1.2	60	40	1
Bt1	0.2	15	40	1
Bt2	0.2	30	40	1
Bt3	0.2	45	40	1
Bt4	0.2	60	40	1
Bt5	0.2	75	40	1
Bt6	0.2	90	40	1
Bq	0.2	45	40	1
Bw1	0.2	45	30	1
Bw2	0.2	45	40	1
Bw3	0.2	45	50	1
Bw4	0.2	45	60	1
Bw5	0.2	45	70	1

Sample Number	SLC-1717 (wt.%)	C6M (wt.%)	R811 (wt.%)	IRG651 (wt.%)
Bn	79.9	9.8	9.8	0.5
Bm	79.9	9.8	9.8	0.5
Bt	79.9	9.8	9.8	0.5
Bw	79.9	9.8	9.8	0.5
Bq1	85.9	3.8	9.8	0.5
Bq2	83.9	5.8	9.8	0.5
Bq3	81.9	7.8	9.8	0.5
Bq4	79.9	9.8	9.8	0.5
Bq5	77.9	11.8	9.8	0.5
Bq6	75.9	13.8	9.8	0.5

Sample Number	365 nm UV Irradiation Intensity ( $m W / c m^{2}$ )	Irradiation Time (min)	Polymerization Temperature (°C)	Mass Fraction of UV-327 in the Films (wt.%)
Bn1	0.2	60	40	0.25
Bn2	0.2	60	40	0.5
Bn3	0.2	60	40	0.75
Bn4	0.2	60	40	1
Bn5	0.2	60	40	1.5
Bm1	0.1	60	40	1
Bm2	0.2	60	40	1
Bm3	0.4	60	40	1
Bm4	0.8	60	40	1
Bm5	1.2	60	40	1
Bt1	0.2	15	40	1
Bt2	0.2	30	40	1
Bt3	0.2	45	40	1
Bt4	0.2	60	40	1
Bt5	0.2	75	40	1
Bt6	0.2	90	40	1
Bq	0.2	45	40	1
Bw1	0.2	45	30	1
Bw2	0.2	45	40	1
Bw3	0.2	45	50	1
Bw4	0.2	45	60	1
Bw5	0.2	45	70	1

Abstract

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Applied Optics