Dual-Emissive CsPbBr₃@Eu-BTC Composite for Self-Calibrating Temperature Sensing Application

Abstract

A dual-emissive optical sensor based on the fluorescence intensity ratio (FIR) technique has been demonstrated to have significant advantages of high sensitivity and reliability. Here, we designed and successfully prepared a selfcalibrated optical luminescent thermometer of CsPbBr 3 quantum dot (QD) encapsulated lanthanide metal−organic frameworks (Eu-BTC), and their phase compositions and luminescence properties have been characterized. Different thermo-response luminescence behaviors originating from the photoluminescence of CsPbBr 3 QDs at 528 nm and the 5 D 0 − 7 F 2 emission of Eu 3+ at 618 nm were investigated in the temperature range of 20−100 °C, in which the dual-emissive temperature-dependent emissions can serve as a ratiometric thermometer for accurate temperature monitoring applications. Significantly, the as-obtained CsPbBr 3 @ Eu-BTC hybrid exhibited a high relative sensitivity (S r ) of 3.9% °C−1 at 20 °C and excellent temperature resolution of 0.004 °C in the measured temperature range, indicating its superiority as a ratiometric luminescent thermometer for temperature sensing. The related luminescent sensing mechanism of the CsPbBr 3 @Eu-BTC is also discussed, and this work provides an effective strategy for the rational design of a reliable and stable thermometer by integrating CsPbBr 3 QDs and a carrier of a luminescent lanthanide organic framework.

Conductive MOFs with Photophysical Properties: Applications and Thin-Film Fabrication

“…Temperature-dependent PL spectra of CsPbBr 3 @Eu-BTC in the temperature range of 20-100 °C excited at 339 nm (inset: the CIE (x, y) coordinate diagram of emission colors at various temperatures). Reprinted with permission from Ref [65]…”

Metal Halide Perovskite Nanocrystals in Metal–Organic Framework Host: Not Merely Enhanced Stability

“…Recently,Liu et al designed anovel self-calibrated optical luminescent thermometer based on the CsPbBr 3 QD@Eu-BTC composite. [31] As shown in Figure 8a…”

“…Recently, the bottle‐around‐ship strategy has also been employed for the encapsulation of CsPbBr 3 NCs into Eu‐BTC (Figure 3 f). [31] …”

Perovskite Nano‐Heterojunctions: Synthesis, Structures, Properties, Challenges, and Prospects

“…[ 106 ] Another strategy is to synthesize perovskite NCs first and then to be introduced to the synthesis process of MOFs. [ 112 ]…”