Efficient Energy Transfer from Trap Levels to Eu3+ Leads to Antithermal Quenching Effect in High-Power White Light-Emitting Diodes

Jiansheng Huo; Aiwen Yu; Quwei Ni; Dandan Guo; Min Zeng; Jinwei Gao; Yong Zhang; Qianming Wang

doi:10.1021/acs.inorgchem.0c02541

Efficient Energy Transfer from Trap Levels to Eu³⁺ Leads to Antithermal Quenching Effect in High-Power White Light-Emitting Diodes

Inorg Chem. 2020 Oct 19;59(20):15514-15525. doi: 10.1021/acs.inorgchem.0c02541. Epub 2020 Oct 8.

Authors

Jiansheng Huo¹, Aiwen Yu¹, Quwei Ni¹, Dandan Guo¹, Min Zeng², Jinwei Gao², Yong Zhang³, Qianming Wang¹

Affiliations

¹ Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China.
² Institute for Advanced Materials, South China Academy of Advanced Optoelectronics and Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Normal University, Guangzhou 510006, P. R. China.
³ Institute of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, P. R. China.

PMID: 33030016
DOI: 10.1021/acs.inorgchem.0c02541

Abstract

The most critical aspect in the assembly of phosphor-converted white light-emitting diodes (pc-WLEDs) is how to stabilize the device in a practical environment. The high applied currents can generate enormous heat up to more than 100 °C, and such a continuous illumination process will lead to serious effects concerning the stability of the device. Therefore, the new search for examples to fully suppress thermal quenching effect is a real challenge. In this study, a novel Eu³⁺-activated CaMgGeO₄ (CMGO) phosphor of olivine type is developed via a conventional solid-state reaction. The results reveal that Eu³⁺ occupies the low symmetric Ca²⁺ site of this host. Upon visible-light sensitization at 464 nm, a dominant red emission band with maximum at 612 nm is witnessed. Its full width at half-maximum (fwhm) is merely ∼4.37 nm, and a high color purity of around 94% is achieved. Their corresponding Commission Internationale de L'Eclairage (CIE) coordinates are very close to standard red color coordinates (0.666, 0.333). The influence of concentration and temperature on the optical property has been explored. It has been discovered that the optimized sample (CMGO:0.01Eu³⁺) is not influenced by the thermal quenching effect and its fluorescent intensity is improved even up to 473 K, which is mainly attributed to the incorporation of abundant trap sites generated by the nonequivalent substitution Eu³⁺ for Ca²⁺. After it is integrated into commercially available YAG:Ce³⁺ phosphor-based pc-WLEDs, the excellent optical parameters of the fabricated WLEDs are evaluated. The correlated color temperature (CCT) varies from cool white (6458 K) to warm (4370 K), and the color rendering index (CRI) increases from 78 to 86 under a high flux operating current of 200 mA. Furthermore, the chromaticity coordinates remain almost stable with the increasing drive current from 200 mA to 1000 mA. It is highly expected that CaMgGeO₄:0.01Eu³⁺ will become a suitable red phosphor for the preparation of white LEDs with high efficiency.