Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 311, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2022.123099
Keywords
Red emitting phosphor; Energy conversion; beta-NaYF4; Negative thermal quenching; Optical materials and properties
Funding
- National Natural Science Foundation of China [21661006, 21965004]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region, China [2019GXNSFDA245022, 2020GXNSFAA159036]
- Scientific Research Foundation of Guangxi University [XDZ140116]
- innovation Project of Guangxi Graduate Education
- Students Experimental Skills and Innovation Ability Training Fund Project of Guangxi University [202010593186]
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A new type of zero thermal quenching effect has been discovered in red-emitting phosphors, leading to high luminescent thermal stability. The integrated emission intensity nonlinearly increases with temperature, indicating the potential application of these phosphors in high-brightness lighting.
Currently, searching for high luminescent thermal stability phosphors has become crucially significant for phosphor-converted white light-emitting diodes. Herein, it is shown that photoluminescence in a beta-NaYF4:xEu(3+) red emitting phosphor exhibits a new type of zero thermal quenching effect. That is that integrated emission intensities nonlinear monotonically increase with the increasing of temperature from 308 to 500 K (35-227 degrees C). For example, the integrated emission intensity at 500 K is 301.9% of that initial value at 308 K. The effect results in the optimal sample having high luminescent thermal stability. A thermal light energy conversion mechanism is suggested for the effect.
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