Morphology controlled synthesis and sensitive temperature sensing performance of Gd2(WO4)3: Er3+, Yb3

• Published in: Materials research bulletin 2023-12, Vol.168, p.112460, Article 112460
• Main Authors: Han, Lili, Wang, Lijuan, Ning, Yayun, Zhou, Wenqain, Miao, Yifan, Tian, Siyuan, Fan, Yuncan, He, Ziqi, Ci, Zhipeng
• Format: Article
• Language: English
• Subjects: fluorescence intensity ratio; light-emitting diode device; up-conversion
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2023.112460

•Er3+/Yb3+-codoped Gd2(WO4)3 microparticles were successfully synthesized.•The morphology and size can be finely controlled and adjusted.•Significant thermal coupling occurs with a higher absolute sensitivity.•Gd2(WO4)3: 5%Er3+, 30%Yb3+ exhibits excellent stability in air and water.•LED device assembled with the products exhibited a bright visible green light. Rare-earth ion doped negative thermal expansion materials as fluorescent thermosensitive materials have attracted significant attention due to their natural advantage in achieving high resolution fluorescence. Herein, Er3+/Yb3+-codoped Gd2(WO4)3 microparticles were developed. Their morphology and size can be finely controlled by manipulating the additives, pH values, and reaction rates. Under near-infrared (NIR) excitation, the compounds evince green and red UC emissions. With regards to the thermal coupling level of 2H11/2/4S3/2 of Er3+ ions, the maximum absolute sensitivity (Sa) and relative sensitivity (Sr) were established to be 1.39 % K−1 (at 300 K) and 1.18 % K−1 (at 293 K), respectively. Ultimately, the utilization of synthesized microparticles and a 940 nm NIR chip facilitated the development of a proficient green-emitting light-emitting diode device. The aforementioned characteristics indicate that Er3+/Yb3+ co-doped Gd2(WO4)3 microparticles possess potential applications in the fields of non-contact optical temperature sensing as well as solid-state lighting. By manipulating the additives, pH values, and reaction rates, the morphology and size of Gd2(WO4)3: Er3+, Yb3+ can be finely controlled and adjusted to desired specifications. Through observation of the temperature-dependent intensity ratios in the green UC emissions, the optical temperature sensing properties were studied. Notably, with regards to the thermal coupling level of 2H11/2/4S3/2, the maximum absolute sensitivity (Sa) and relative sensitivity (Sr) were established to be 1.39 % K−1 (at 300 K) and 1.18 % K−1 (at 293 K), respectively. The aforementioned corresponds to the principle of the pump photon modulation rule observed in the fluorescence intensity ratio levels at different temperatures. Ultimately, the utilization of synthesized microparticles and a 940 nm NIR chip facilitated the development of a proficient green-emitting Light-Emitting Diode (LED) device which was subsequently evaluated for solid-state lighting. The aforementioned attributes render the Er3+/Yb3+-codoped Gd2(WO4)3 microparticles highly versatile, making