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Negative Thermal Quenching of Photoluminescence- an Evaluation from Macroscopic Viewpoint
Version 1
: Received: 8 December 2023 / Approved: 9 December 2023 / Online: 11 December 2023 (06:15:54 CET)
A peer-reviewed article of this Preprint also exists.
Yan, S. Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint. Materials 2024, 17, 586. Yan, S. Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint. Materials 2024, 17, 586.
Abstract
Negative thermal quenching (NTQ) denotes that the integral emission spectral intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. NTQ has been a subject of intensive investigation in recent years and a large number of phosphors were reportedly to have exhibited NTQ. In this paper, a collection of results in the archival literature about NTQ of specific phosphors are discussed from a macroscopic viewpoint in the following three aspects:1) Could NTQ of a given phosphor be reproducible?2) Could the associated data for a given phosphor exhibited NTQ be in line with the law of conservation of energy?3) Could NTQ of a given phosphor be demonstrated in a prototype WLED device? By analyzing typical cases based on common sense, it is hoped to increase the awareness for the issues with the papers reporting NTQ of the specific phosphors based on spectral intensity along with for the importance of keeping stability and consistency of the measurement conditions in temperature-dependent spectral intensity measurement which is a prerequisite for the validity of the measurement results.
Keywords
Reliability assessment; Negative thermal quenching; Consistency of the measurement condition.
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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