BN/CsPbX3 Composite Nanocrystals: Synthesis and Applications in White LED

doi:10.15541/jim20180207

Abstract

Abstract:

All inorganic perovskite (CsPbX₃) nanocrystals has wide applications in the field of optoelectronic devices due to its excellent photoelectric characteristics, however, stability is still the bottleneck restricting its development. Combining with the current research progress, the BN/CsPbX₃ composite nanocrystals phosphors was synthesized via all-solid-state reactions. During the process, parameters of ball milling, ratio of reactants and other reaction conditions were optimized, thus the BN/CsPbX₃ composite nanocrystals can be stable in the air for more than 60 days. Its luminescence wavelength can cover the range of 417-680 nm with full width at half maximum of 23-47 nm, showing high color purity, and was further used in white LED with high stability and luminance. After placed in the atmosphere for a month, the attenuation of LED luminance is only about 0.7%, and less than 4% deterioration was observed after continuous work of 2 h, showing great working stability.

Key words: all-inorganic perovskite, stability, all-solid-state reaction, white LED applications

CLC Number:

TQ174

DONG Yu-Hui, ZENG Shu-Yu, HAN Bo-Ning, XUE Jie, SONG Ji-Zhong, ZENG Hai-Bo. BN/CsPbX₃ Composite Nanocrystals: Synthesis and Applications in White LED[J]. Journal of Inorganic Materials, 2019, 34(1): 72-78.

Figures/Tables 15

Fig. 1 Scheme of the all-solid-state ball milling procedure for synthesis of CsPbX3 NCs (a) and optical image of large-scale red emission powder under UV light excitation (365 nm) (b)

Fig. 2 (a) PL emission spectra of CsPbX3 NCs powder, the corresponding optical images under normal daylight and UV light (black background) were exhibited inside; (b) Color gamut spectra of perovskite NCs (the inner black line indicating NTSC)

Fig. 4 The air stability of CsPbI3 NCs powder (a) The PL stability exposed in air; (b) X-ray diffraction (XRD) pattern of CsPbI3 NCs powder; (c) Photographs of the powder samples with time changing under the sunlight (left) and UV light (right)

Fig. 5 Analysis of air stability of CsPbI3 NCs (a) Stability test of CsPbI3 NCs powder with different BN quantity; (b) SEM image of CsPbI3 NCs; (c) Energy dispersive spectroscopy (EDS) mapping images of (b)

Fig. 6 Proof-of-concept demonstration of white LED by blending green and red Pe-NCs on a commercial blue LED chip (a) Schematically depicts the packing method of white LED; (b) EL spectra of three typical devices exhibiting (1) green-white, (2) white, and (3) red-white; (c) Photographs of the white LED under different operating voltage

Fig. 7 The stability of white-light LED (a) The luminance stability of white-light LED placed in the air measured at the voltage of 2.7 V; (b) The working stability of the white-light LED after continuous operating for 2 h

Fig. S1 PL intensity of CsPbBr3 NCs powder with different size of grind medium under the same test condition

Fig. S2 PL intensity of CsPbBr3 NCs powder with different ball-to-powder ratio under the same condition

Fig. S3 PL spectra of CsPbBr3 NCs powder with various rotation speed of the planetary mill

Table s1 Comprehensive comparisons for the representative perovskite NCs

CsPbX₃	Emission peak/nm	FWHM/nm	CsPbX₃	Emission peak/nm	FWHM/nm
CsPbCl₃	417	23	CsPbIBr₂	551	41
CsPbCl_2.14Br_0.86	430	23	CsPbI₂Br	605	47
CsPbCl₂Br	447	27	CsPbI_2.14Br_0.86	642	46
CsPbClBr₂	483	38	CsPbI₃	680	40
CsPbBr₃	532	33

Table s2 Comparison of FWHM of CsPbX3 with typical solution synthesis

Sample	Synthetic methods	FWHM/nm	Color/nm	Ref.
CsPbX₃(X=Cl, Br, I)	All-solid-state ball milling	23-47	417-680	This work
CsPbX₃(X=Cl, Br, I)	Supersaturated recrystallization	12-39	400-650	[1]
CsPbX₃(CsPb(Br/Cl)₃ -CsPbI₃)	Droplet-based microfluidic platform	20-45	470-690	[2]
CsPbX₃(X=Cl, Br, I)	Fast Anion-Exchange	12-40	410-700	[3]

Fig. S4 The X-Ray diffraction spectra of CsPbX3 NCs powder with various halogen ratios

Fig. S5 The PL spectrum of CsPbI3 powder adding amount of 0.2 g of BN

Fig. S3 EDS information of CsPbI3 NCs powder (a) SEM image with corresponding atomic percentage information; (b) EDS spectrum of CsPbI3 NCs

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BN/CsPbX₃ Composite Nanocrystals: Synthesis and Applications in White LED

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