Air‐Stable Solid‐State Photoluminescence Standards for Quantitative Measurements Based on 4′‐Phenyl‐2,2′ : 6′,2′′‐Terpyridine Complexes with Trivalent Lanthanides

Abstract

Correct photoluminescence quantum yield (PLQY) determination in the solid state is vital for numerous application fields, such as photovoltaics, solid lighting or the development of phosphors. In order to increase the limited number of suitable standards for such determinations, two new Ln3+‐based complexes with 4′‐phenyl‐2,2′ : 6′,2“‐terpyridine γ‐[Ln4(OAc)12(ptpy)2] (1‐Eu with europium and 1‐Tb with terbium) are presented. The corresponding complexes show solid‐state QYs of 58(4) % and 46(3) %, respectively, exhibiting broadband absorption in the UV range from 380–200 nm. As Ln3+ ions in general exhibit narrow f‐f transitions, spectral regions with a broadness of 20–35 nm can be checked. Both complexes have suitable thermal stability, up to 270 °C, and are stable with respect to air and humidity, for 1‐Eu up to 75 % and for 1‐Tb up to 53 % relative humidity. These complexes are altogether suitable as standards to increase the reliability of PLQY determination and proposed to be used for a relative PLQY determination in the solid state.

Enhancing the Analysis of Eu3+ Photoluminescence in Coordination Compounds in the Solid State by Determining their Refractive Index

“…: 53–57 %), [70,71] γ‐[Tb 4 (OAc) 12 (ptpy) 2 ] (measured: 44.8(9) %; lit. : 46 %), [72] and γ‐[Eu 4 (OAc) 12 (ptpy) 2 ] (measured: 57.8(6) %; lit. : 58–62 %) [72] .…”

“…: 46 %), [72] and γ‐[Eu 4 (OAc) 12 (ptpy) 2 ] (measured: 57.8(6) %; lit. : 58–62 %) [72] . Solid samples were filled in a micro cell quartz cuvette (Starna 18‐F/ST/C/Q/10; fluorescence with ST/C closed‐cap, material UV quartz glass Spectrosil Q, pathlength 10 mm, matched).…”

“…: 58-62 %). [72] Solid samples were filled in a micro cell quartz cuvette (Starna 18-F/ST/C/Q/10; fluorescence with ST/C closed-cap, material UV quartz glass Spectrosil Q, pathlength 10 mm, matched). A cuvette filled with magnesium oxide was used as reference material.…”

Nano vs. bulk: surfactant-controlled photophysical and morphological features of luminescent lanthanide MOFs

“…An additional check using another standard material g-[Tb 4 (OAc) 12 (ptpy) 2 ] veried the calibration of the Quanta-4 Integrating Sphere (l ex = 310 nm, l em = 450-700 nm; F exp = 46(1)%, F lit = 46(3)% (ref. 63)). Ln 3+based QYs were determined with l ex = 310 nm and l em = 450-700 nm.…”

Syntheses, Crystal Structures, and Luminescence of Hexafluoroacetylacetone Dinuclear Lanthanide Complexes Bridged by “Back-to-Back” Bisterpyridine

“…Typically, for Tb(III) complex with terpyridines, the QY is several times lower than that for the Eu(III) analogue due to the position of the ligand triplet state energy level. 64 And it was reported by Zeng et al that in the cocrystals Eu(NO 3 ) 5 •H 2 tppz and Tb(NO 3 ) 5 •H 2 tppz, the energy absorbed on tppz could transfer to Eu(III), but could not transfer to Tb(III). 65 As shown in Table 2, the same phenomenon was also observed in the mononuclear [Eu(hfac) 3 (ptpy)] and [Tb(hfac) 3 (ptpy)] complexes.…”