Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing

Qian Xiong; Sihao Huang; Zijun Zhan; Juan Du; Xiaosheng Tang; Zhiping Hu; Zhengzheng Liu; Zeyu Zhang; Weiwei Chen; Yuxin Leng

doi:10.1364/PRJ.442659

Journals >Photonics Research >Volume 10 >Issue 3 >Page 628 > Article

Photonics Research
Vol. 10, Issue 3, 628 (2022)

Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing

Qian Xiong^{1、2、3、4}, Sihao Huang¹, Zijun Zhan², Juan Du^{1、2、5、7、*}, Xiaosheng Tang^6、8、*, Zhiping Hu², Zhengzheng Liu¹, Zeyu Zhang², Weiwei Chen⁶, and Yuxin Leng^{1、2、3、9、*}

Author Affiliations

¹State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai 201800, China

²Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

³School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

⁴Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

⁵School of Physics and Electronics, Shandong Normal University, Jinan 250014, China

⁶College of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chongqing 400065, China

⁷e-mail: dujuan@mail.siom.ac.cn

⁸e-mail: xstang@cqupt.edu.cn

⁹e-mail: lengyuxin@mail.siom.ac.cn

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DOI: 10.1364/PRJ.442659 Cite this Article Set citation alerts

Qian Xiong, Sihao Huang, Zijun Zhan, Juan Du, Xiaosheng Tang, Zhiping Hu, Zhengzheng Liu, Zeyu Zhang, Weiwei Chen, Yuxin Leng. Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing[J]. Photonics Research, 2022, 10(3): 628 Copy Citation Text

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(a) Passivation and ligand modification procedure on the surface of the CsPbBr3 QDs. (b) XRD patterns and (c) FTIR spectra for CsPbBr3 QDs with different ligands. HRTEM images for (d) CsPbBr3-OAm and (e) CsPbBr3-OLA QDs.

Fig. 1. (a) Passivation and ligand modification procedure on the surface of the CsPbBr3 QDs. (b) XRD patterns and (c) FTIR spectra for CsPbBr3 QDs with different ligands. HRTEM images for (d) CsPbBr3-OAm and (e) CsPbBr3-OLA QDs.

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Fig. 2. (a) XPS profiles for CsPbBr3-OAm and CsPbBr3-OLA QDs, (b) Cs-3d spectrum, (c) Pb-4f spectrum, and (d) Br-3d spectrum.

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Fig. 3. (a) PL spectrum, (b) absorption spectrum, and (c) time-resolved PL decay of CsPbBr3-OAm and CsPbBr3-OLA QDs. PL stability measurement for (d) CsPbBr3-OAm and (e) CsPbBr3-OLA QDs under heating conditions. (f) PL intensity variation of QDs films over 10 h under heating conditions. (g) Photographs under daylight and 365 nm UV light of CsPbBr3-OAm and CsPbBr3-OLA QDs for 100 days in hexane. (h) PLQY variation of QDs solution in air over 100 days.

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Fig. 4. (a) TEM image, (b) HRTEM image, and (c) element mapping of CsPbBr3-OAm/SiO2 composite. (d) TEM image, (e) HRTEM image, and (f) element mapping of CsPbBr3-OLA/SiO2 composite.

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Fig. 5. Random lasing from the composite film under two-photon excitation. (a) Schematic of random lasing from CsPbBr3/SiO2 composite film upon 800 nm excitation above lasing threshold. (b) Power-dependent emission spectra from CsPbBr3-OAm/SiO2 composite film. (c) Integrated lasing intensity of CsPbBr3-OAm/SiO2 composite film as a function of power fluence showing the lasing threshold at 257.34 μJ/cm2. (d) Power-dependent emission spectra from CsPbBr3-OLA/SiO2 composite film. (e) Integrated lasing intensity of CsPbBr3-OLA/SiO2 composite film as a function of power fluence showing the lasing threshold at 79.81 μJ/cm2.

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Fig. 6. Gaussian fitting of a selected lasing peak corresponding to the Q-value from (a) CsPbBr3-OAm/SiO2 and (b) CsPbBr3-OLA/SiO2.

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	$τ_{1}$ (ns)	$A_{1}$ (%)	$τ_{2}$ (ns)	$A_{2}$ (%)	$τ_{a}$ (ns)
OLA-QDs	3.4	157.9	14.6	44.8	9.5
OAm-QDs	5.8	113.7	21.2	80.1	16.9

Table 1. Time-Resolved PL Decays for CsPbBr₃-OLA QDs and CsPbBr₃-OAm QDs

Qian Xiong, Sihao Huang, Zijun Zhan, Juan Du, Xiaosheng Tang, Zhiping Hu, Zhengzheng Liu, Zeyu Zhang, Weiwei Chen, Yuxin Leng. Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing[J]. Photonics Research, 2022, 10(3): 628

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