A negative-thermal-quenching LaMgAl11O19: Er3+, Sm3+ phosphor achieved by energy transfer from Er3+ to Sm3+

Authors: Min, X., Lao, C.Y., Liu, Y., Ji, H., Wu, X., Liu, Y., Huang, Z., Fang, M., Abdelkader, A.M., Kumar, R.V., Xi, K.

Journal: Journal of Luminescence

Publication Date: 01/03/2024

Volume: 267

ISSN: 0022-2313

DOI: 10.1016/j.jlumin.2023.120380

Abstract:

Phosphor-converted white light-emitting diodes (pc-wLEDs) are drawing ever-increasing attention towards electronic applications. However, thermal quenching, the intensity decay with increasing temperature, presents a significant challenge for high power operation. We reverse the effect with a negative-thermal-quenching property based on energy transfer from one luminescent center to another center. The LaMgAl11O19: Er³⁺, Sm³⁺ (LMA: LaMgAl11O19: Er³⁺, Sm³⁺) phosphor has been designed, which shows a positive relationship between emission intensity and operating temperature up to 573 K (300 °C). As the temperature rises, energy transfer from Er³⁺ to Sm³⁺ occurs with higher efficiency because of stronger ionic vibration. As a result, the phosphor luminescence intensity at elevated temperatures is enhanced. Our design for negative-thermal quenching phosphor laid the foundation for the research of high-power pc-wLEDs or lasers at higher temperatures. It also has potential for wide-temperature-sensing-range radiometric optical thermometry applications.

https://eprints.bournemouth.ac.uk/39488/

Source: Scopus