An organic–inorganic hybrid K₂TiF₆ : Mn⁴⁺ red-emitting phosphor with remarkable improvement of emission and luminescent thermal stability

Abstract

KTF : MEAH+, Mn4+ exhibits good luminescent thermal stability at high temperatures, and the maximum integrated PL intensity at 150 °C is 2.34 times the initial value at 30 °C.

Enhancement of Emission and Negative Thermal Quenching Effect of Na2TiF6:Mn4+,TEAH+ by Antenna Effect of TEAH+

“…Furthermore, what‘s obvious is that the fluorescent intensity of the sample (ii) at 627 nm peak is 150 % that of the sample (i). This is similar to the reported results of K 2 TiF 6 : MEAH + ,Mn 4+ (monoethanolamine=MEA), [32,33] which can be attributed to the antenna effect of organic compounds [23–27] . The emission intensity of KTF : TEAH + ,Mn 4+ is only 136 % that of the un‐hybrid control sample.…”

“…Table 2 depicts the cell volumes of the samples (i–ii), and their order is as follows: (ii)>PDF#43‐0522> (i). The reasons for the results in Table 2 are: (a) The ionic radii of Ti 4+ and Mn 4+ are 0.61 and 0.53 Å, respectively, [32] so the lattice volume of the sample (i) is slightly smaller than that of PDF#43‐0522, due to some octahedral lattice sites of Ti 4+ being occupied by Mn 4+ . (b) Since TEAH + is a relatively large organic group, and the unit cell volume of NTF : Mn 4+ ,TEAH + is further expanded, so its cell volume is slightly larger than that of PDF#43‐0522.…”

“…In our previous work, [32,33] Mn 4+ doped organic‐inorganic hybrid potassium fluotitanate phosphors (K 2 TiF 6 : MEAH + , Mn 4+ , MEA: monoethanolamine) with enhancements of emission intensity and luminous thermal stability were synthesized. It is likely that the enhancements are also caused by the antenna effect.…”

Compositional engineering of ZnBr2-doped CsPbBr3 perovskite nanocrystals: insights into structure transformation, optical performance, and charge-carrier dynamics

“…7b, suggest that Zn-doped PNCs exhibit fewer shifts than pristine PNCs at higher temperatures. Notably, the smaller the chromaticity shift (ΔE), the higher the color stability; 54 thus, the Zn-doped material is preferable to CsPbBr 3 , demonstrating a higher possibility of satisfying the requirements of WLEDs. The temperature-dependent International Commission on Illumination (CIE) chromaticity coordinates for pristine and 60% ZnBr 2 -doped PNCs are located in the green region of the CIE 1931 chromaticity plot (Fig.…”

Computational analysis, Urbach energy and Judd–Ofelt parameter of warm Sm3+complexes having applications in photovoltaic and display devices

“…The present scenario of technical evaluation in the field of global level illumination is promptly surging for intriguing material and science innovators to achieve present illumination targets by exploring energy saving display devices in an environmentally benign manner. 1 Thus, organic lanthanide complexes mark a major achievement to complete ecological illumination requirements and are also eco-friendly for the environment with respect to incandescent and fluorescent lamps. 2–4 Recent research focuses on the synthesis of highly energy conserving organic lanthanide complexes by a liquid-assisted grounding method, 5 which indicated their successful use in display devices, optoelectronic appliances, bioimaging, solar cells, etc.…”