Suppression of Eu²⁺ Luminescence Loss

Abstract

Owing to the intriguing luminescence properties, Eu2+ is one of the most desirable activators for next‐generation lighting devices. Yet the application of Eu2+‐doped phosphors is limited because of the drawback of inferior luminescence efficiency. Understanding of this issue is generally from perspectives of frame structural rigidity and electronic band structure, while the lack of persuasiveness of this paradigm is frequently noticed. Herein, the analysis is conducted from a fresh view to investigate the outstanding luminescence properties of Eu2+‐doped SrMgP2O7 owning the narrow‐band emission and near‐unity quantum yield. The structural rigidity of materials is elaborately evaluated, and the influence of ionization on the luminescence efficiency of material is carefully discussed. Efforts are also made to assess the effect of vibronic coupling on 4f−5d transition of Eu2+ and clarify the excitation energy transfer route by using X‐ray spectroscopy. Based on these discussions, the synergy of weak electron−vibration interaction and inactive ionization causes the suppression of Eu2+ luminescence loss, which is associated with highly rigid local coordination and strong binding of Eu2+ to its valence electrons in the system, respectively. This work provides insight into the luminescence mechanism of Eu2+, which benefits the exploration of novel phosphors with superior luminescence features.

Facile Synthesis of Highly Efficient and Thermally Stable BaAl4Sb2O12:Eu2+ Phosphor in Air

“…Among them, Eu 2+ ions have attracted much attention on account of broadband absorption, remarkable efficiency, and emission intensity. [ 23–25 ] In order to better meet the application of PC‐WLEDs, Eu 2+ doped phosphors still have a number of challenging obstacles to solve. [ 26,27 ] On the one hand, a reducing atmosphere (such as H 2 or CO) is necessary to obtain highly efficient Eu 2+ ‐doped phosphors in the high‐temperature solid‐state reaction.…”

Highly Luminescent Earth‐Benign Organometallic Manganese Halide Crystals with Ultrahigh Thermal Stability of Emission from 4 to 623 K

“…Recently, Mahdi et al proposed that the robust coordination environment of luminescence centers is also pivotal in achieving high TQ resistance based on ab initio molecular dynamics simulations (AIMD), [70] and this concept has been verified in numerous phosphors. [48,51,53,71,72] Accordingly, bond lengths and angles related to Mn 2+ were inspected carefully and listed in Table S5 (Supporting Information). Also, to better visualize the variation at different temperatures, the values of bond lengths and angles were normalized to those at 100 K and plotted in Figure 3c as a function of temperature.…”

Bionic Micro‐Texture Duplication and RE3+ Space‐Selective Doping of Unclonable Silica Nanocomposites for Multilevel Encryption and Intelligent Authentication

“…On the other hand, rare earth ions (RE 3+ ) have rich energy level structures and unique spectral characteristics, and their emission wavelengths can vary from ultraviolet to infrared, which are often used as emission centers in fluorescent materials. [58][59][60][61][62] Based on porous structured glasses and different RE 3+ doping, multicolor fluorescent glasses can be constructed by the control of the fluorescent color and position. [63] Generally, RE 3+ doped glasses are transparent and non-fluorescent under natural light, while characteristic fluorescence emissions appear under the excitation of specific light, thus providing a valuable reference for information encryption in glass.…”