TY - JOUR
T1 - Room temperature synthesis of highly stable near-infrared FAPbI3@TEOS perovskite phosphor for NIR light-emitting diodes
AU - Huang, Wei Lun
AU - Chu, Sheng Yuan
N1 - Funding Information:
The amount of silane in the entire synthesis process is crucial in the constitution of the SiO2 shell. Thereby, the reaction system for synthesizing FAPbI3@SiO2 perovskite NCs with different amount of TEOS from 100 to 200 μL were examined and detailed discussion is shown in Fig. 5. Through the appearance analysis of the TEM image, it is known that the thickness of SiO2 shell can be controlled. If the content of TEOS was only 100 μL, a large number amount of FAPbI3 perovskite QDs could not completely wrapped in SiO2 (shown in Fig. 5(a)). Further increasing the TEOS content to 150 μL, the SiO2 shells structure is gradually formed and every FAPbI3 perovskite QDs are entirely incorporated in SiO2 shell layers, as shown in Fig. 5(b). When the content of TEOS was increased to 200 μL, a large amount of FAPbI3 perovskite QDs aggregated in huge SiO2 microsphere (see Fig. 5(c)) [37,47]. The PL trends of FAPbI3@SiO2 perovskite NCs were collected to discuss the effect of silane. In Fig. 5(d), Increase the concentration of TEOS does not observe the location of peaks shift for the FAPbI3@SiO2 perovskite NCs. However, the relative PL intensities were increased along with the TEOS added. But the content of TEOS exceeds 150 μL, the PL intensity will decrease as the content increases. At the same time, the solutions of emission colors under UV light excitation were changed from darker NIR for non-wrapped perovskite QDs to brilliant NIR (100 μL, 150 μL), and darker NIR (200 μL) (See Fig. S2, Supporting Information). This trend can be explained that SiO2 shell could reduce the activated nonradiative deactivation in the FAPbI3@SiO2 perovskite NCs [27]. The highest PLQYs (57.2%) of FAPbI3@SiO2 perovskite NCs (150 μL) is attributed to effectively passivate surface defects and reduce the possibility of excitons being captured. When the content of TEOS is more than 150 μL, large amount of TEOS will cover the surface of the FAPbI3 perovskite QDs and cause the formation of steric hindrance, leads to a drop in PLQYs (36.6%). Then, if the content of TEOS is less than 150 μL, a small amount of inorganic silica is not enough to wrap FAPbI3 perovskite QDs and cause surface defects, thereby reducing PLQYs (49.5%) [49,50]. To further investigate the effectively passivate the surface defects of FAPbI3 perovskite QDs by SiO2 wrapping, PL lifetime of FAPbI3@SiO2 perovskite NCs with different amount of TEOS from 100 to 200 μL were examined and shown in Fig. 5(e). It is inspected that 150 μL of TEOS to wrap FAPbI3 perovskite QDs has a longest lifetime (∼118.3ns) and this TRPL results are consistent with PLQY analysis of Fig. 5(d).This work was supported by the Ministry of Science and Technology, Taiwan, under Grant No. MOST 110-2221-E-006-206-. The authors would like to extend heartfelt thanks for the use of the TEM (JEM-2100) apparatus in the Advanced Instrument Center of National Cheng Kung University.
Funding Information:
This work was supported by the Ministry of Science and Technology, Taiwan , under Grant No. MOST 110-2221-E-006-206 -. The authors would like to extend heartfelt thanks for the use of the TEM (JEM-2100) apparatus in the Advanced Instrument Center of National Cheng Kung University.
Publisher Copyright:
© 2023 Elsevier Ltd and Techna Group S.r.l.
PY - 2023/5/15
Y1 - 2023/5/15
N2 - In some medical laboratory tests, a sampling method via intravenous injection is required. Previous research pointed out using near-infrared (NIR) light vein detectors to reduce erroneous injections. Therefore, low-cost, high-efficiency and stability NIR phosphors are highly essential. Herein, high-stability, ultrathin SiO2 wrapped NIR-CH(NH2)2PbI3 (FAPbI3) perovskite nanocrystals (NCs) are successfully manufactured via one-step method at room temperature atmospheric synthesis. By optimizing the hydrolytic condensation conditions of tetraethoxysilane (TEOS), the resulting FAPbI3@SiO2 perovskite NCs phosphors exhibits a high photoluminescence quantum yields (PLQYs) of 57.2% and improves water resistance and thermostability. The low-cost NIR light-emitting diodes (NIR-LEDs) fabricated by coating NIR-FAPbI3@SiO2 perovskite NCs phosphors on commercial blue InGaN LEDs chip demonstrated a ∼787 nm EL spectra of NIR-LEDs under the startup voltage of 2.6 V. Even after 12 h of continuous working, no significant changes were observed in the EL spectra of the NIR-LEDs, which indicates that NIR-FAPbI3@SiO2 perovskite NCs phosphor has high capacity in biological applications.
AB - In some medical laboratory tests, a sampling method via intravenous injection is required. Previous research pointed out using near-infrared (NIR) light vein detectors to reduce erroneous injections. Therefore, low-cost, high-efficiency and stability NIR phosphors are highly essential. Herein, high-stability, ultrathin SiO2 wrapped NIR-CH(NH2)2PbI3 (FAPbI3) perovskite nanocrystals (NCs) are successfully manufactured via one-step method at room temperature atmospheric synthesis. By optimizing the hydrolytic condensation conditions of tetraethoxysilane (TEOS), the resulting FAPbI3@SiO2 perovskite NCs phosphors exhibits a high photoluminescence quantum yields (PLQYs) of 57.2% and improves water resistance and thermostability. The low-cost NIR light-emitting diodes (NIR-LEDs) fabricated by coating NIR-FAPbI3@SiO2 perovskite NCs phosphors on commercial blue InGaN LEDs chip demonstrated a ∼787 nm EL spectra of NIR-LEDs under the startup voltage of 2.6 V. Even after 12 h of continuous working, no significant changes were observed in the EL spectra of the NIR-LEDs, which indicates that NIR-FAPbI3@SiO2 perovskite NCs phosphor has high capacity in biological applications.
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U2 - 10.1016/j.ceramint.2023.01.175
DO - 10.1016/j.ceramint.2023.01.175
M3 - Article
AN - SCOPUS:85150473935
SN - 0272-8842
VL - 49
SP - 15802
EP - 15810
JO - Ceramics International
JF - Ceramics International
IS - 10
ER -