Radiation-pressure-induced photoluminescence enhancement of all-inorganic perovskite CsPbBr<sub>3</sub> quantum dots

Ying Zhang; Haiou Zhu; Taiwu Huang; Zongpeng Song; Shuangchen Ruan

doi:10.1364/PRJ.7.000837

Photonics Research, Volume. 7, Issue 8, 837(2019)

Radiation-pressure-induced photoluminescence enhancement of all-inorganic perovskite CsPbBr₃ quantum dots

Ying Zhang^1,2, Haiou Zhu³, Taiwu Huang¹, Zongpeng Song², and Shuangchen Ruan^2,3、*

¹Center for Advanced Material Diagnostic Technology, College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China

²Guangdong Provincial Key Laboratory of Mico/Nano Optomechatronics Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China

³College of New Materials and New Energies, Shenzhen University of Technology, Shenzhen 518118, China

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Fig. 1. (a) UV−vis absorption and PL emission spectra of CsPbBr3 QDs. The inset shows the cubic perovskite structure of CsPbBr3 (left) and schematic of perovskite CsPbBr3 QDs after irradiation pressure (right). (b) TEM images of CsPbBr3. The inset is the HRTEM image. (c) Changes in the PL spactra of CsPbBr3 QDs under different radiation pressures of laser. The inset shows the beam quality of non-uniform Gaussian distribution. (d) PL spectra of the original and radiation pressure-processed CsPbBr3 QDs.

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$XPS profiles corresponding to (a) Cs 3d, (b) Pb 4f, and (c) Br 3d of original and radiation pressure CsPbBr3 QDs. (d) XRD patterns of perovskite CsPbBr3 QDs with and without radiation pressure. The black line represents original QDs, and the red line represents radiation pressure QDs. The corresponding Miller indices are labeled at the top of the diffraction peaks. (e) Optical absorption of CsPbBr3 QDs with increasing radiation pressure.$

Fig. 2. XPS profiles corresponding to (a) Cs 3d, (b) Pb 4f, and (c) Br 3d of original and radiation pressure CsPbBr3 QDs. (d) XRD patterns of perovskite CsPbBr3 QDs with and without radiation pressure. The black line represents original QDs, and the red line represents radiation pressure QDs. The corresponding Miller indices are labeled at the top of the diffraction peaks. (e) Optical absorption of CsPbBr3 QDs with increasing radiation pressure.

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Fig. 3. (a) TR-PL decays for perovskite films with radiation pressure CsPbBr3 QDs. (b) Schematic energy diagram of the EF and STE states in original (left) and radiation pressure (right) perovskite QDs.

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Fig. 4. (a) fs-TA spectra (excitation 400 nm) taken at several representative probe delays and (b) decay-associated spectra (DAS) for the original CsPbBr3 QDs. (c) fs-TA spectra (excitation 400 nm) taken at several representative probe delays and (d) decay-associated spectra (DAS) for the radiation pressure CsPbBr3 QDs.

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Fig. 5. (a) Schematic diagram of the configuration of the prototype LED device. Normalized emission PL spectra at an applied current of 20 mA using green emissive (b) original and (c) radiation pressure CsPbBr3 QDs films. (d) Current efficiency of the devices as a function of current. (e) Power efficiency of the devices as a function of luminance.

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Fig. 6. (a) SEM image of CsPbBr3 QDs thin film. (b)–(d) Elemental mappings of Cs, Pb, and Br in CsPbBr3 QDs.

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Fig. 7. TEM and high-resolution TEM images of radiation pressure CsPbBr3 QDs thin film.

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Fig. 8. Comparison of AFM images of (a) the original and (b) radiation pressure CsPbBr3 films. The root mean square roughness is 6.615 nm and 14.63 nm, respectively.

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Table 1. Lifetime Fitting Results of CsPbBr3 QDs Sample
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Table 1. Lifetime Fitting Results of CsPbBr3 QDs Sample
Original QDs After Radiation Pressure
Value (ns) Relative (%) Value (ns) Relative (%)
$τ_{1}$ $2.624 \pm 0.096$ 91 $3.771 \pm 0.095$ 88
$τ_{2}$ $11.45 \pm 0.145$ 9 $20.1 \pm 0.941$ 12
$τ_{avg}$ 3.42 5.75

Table 2. Resulting DAS-Related Characteristic Time Constants of Original and Radiation Pressure CsPbBr3 Samples
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Table 2. Resulting DAS-Related Characteristic Time Constants of Original and Radiation Pressure CsPbBr3 Samples
$τ_{1}$ (ps) $τ_{2}$ (ps) $τ_{3}$ (ps)
Original QDs $1.768 \pm 0.310$ $13.65 \pm 2.5$ $121.9 \pm 20$
After radiation pressure $0.644 \pm 0$ $12.80 \pm 2.4$ $140.1 \pm 19$

Table 3. Transport Properties of Original and Radiation Pressure CsPbBr3 Samples
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Table 3. Transport Properties of Original and Radiation Pressure CsPbBr3 Samples
Resistivity (Ω·cm) Mobility ( ${cm}^{2} \cdot v^{- 1} \cdot s^{- 1}$ ) Density ( ${cm}^{- 3}$ )
Original QDs 210.2 1.61 $5.6 \times 10^{14}$
After radiation pressure 61.0 3.83 $1.08 \times 10^{15}$

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Ying Zhang, Haiou Zhu, Taiwu Huang, Zongpeng Song, Shuangchen Ruan, "Radiation-pressure-induced photoluminescence enhancement of all-inorganic perovskite CsPbBr₃ quantum dots," Photonics Res. 7, 837 (2019)

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Paper Information

Category: Optical and Photonic Materials

Received: Mar. 12, 2019

Accepted: May. 26, 2019

Published Online: Jul. 11, 2019

The Author Email: Shuangchen Ruan (scruan@szu.edu.cn)

DOI:10.1364/PRJ.7.000837

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Lifetime Fitting Results of CsPbBr3 QDs Sample

Table 1. Lifetime Fitting Results of CsPbBr3 QDs Sample

Table 2. Resulting DAS-Related Characteristic Time Constants of Original and Radiation Pressure CsPbBr3 Samples

Table 2. Resulting DAS-Related Characteristic Time Constants of Original and Radiation Pressure CsPbBr3 Samples

Table 3. Transport Properties of Original and Radiation Pressure CsPbBr3 Samples

Table 3. Transport Properties of Original and Radiation Pressure CsPbBr3 Samples