Photonic Effects for Magnetic Dipole Transitions

Abstract

The radiative transition probability is a fundamental property for optical transitions. Extensive research, theoretical and experimental, has been conducted to establish the relation between the photonic environment and electric dipole (ED) transition probabilities. Recent work shows that the nanocrystal (NC)-cavity model accurately describes the influence of the refractive index n on ED transition rates for emitters in NCs. For magnetic dipole (MD) transitions, theory predicts a simple n3 dependence. However, experimental evidence is sparse and difficult to obtain. Here we report Eu3+-(with distinct ED+MD transitions) and Gd3+-(MD transitions) doped β-NaYF4 NC model systems to probe the influence of n on ED and MD transition probabilities through luminescence lifetime and ED/MD intensity ratio measurements. The results provide strong experimental evidence for an n3 dependence of MD transition probabilities. This insight is important for understanding and controlling the variation of spectral distribution in emission spectra by photonic effects.

Thermodynamic Programming of Erbium(III) Coordination Complexes for Dual Visible/Near‐Infrared Luminescence

“…[a] For the solid‐state samples, τ Er,rad was calculated assuming that the structures are similar in different media and taking into account a simple n 3 dependence [Eq. (2)] of the refractive index with n solid =1.517 and n CH3CN =1.344 . [b] c =3 m m .…”

Duel‐Responsive Hybrid Nanoparticle with Energy Transfer Modulated Near Infrared Emission

“…where I (t) is the emission intensity at time t . As a reference, the luminescence decay for OFBT bound to undoped NaYF 4 NPs was also measured (red) with τ avg =13.0 ns.…”

“…where I(t) is the emission intensity at time t. [24,25] As a reference, the luminescence decay for OFBT bound to undoped NaYF 4 NPs was also measured (red) with τ avg = 13.0 ns. The OFBT emission in the OFBT@ NaYF 4 : Nd 3 + hybrid NPs (blue) shows a faster decay with a τ avg of 10.4 ns, indicating that energy transfer from OFBT to Nd 3 + occurs which reduces the lifetime by introducing an extra decay channel through Förster-type energy transfer.…”

Room‐Temperature Linear Light Upconversion in a Mononuclear Erbium Molecular Complex

“…[17] Thea bsorption spectrum (Figure 1b)d isplays the expected Er-centered transitions with non-negligible (for f-f transitions) molar absorption coefficients (2 e 7Lmol À1 cm À1 ), which are still compatible with millisecondrange radiative lifetimes (Figure 1b;Supporting Information, Table S1). [18] Theemission spectrum of [Er(L4) 3 ] 3+ ,which was recorded upon ligand-centered excitation, displays residual 1 p*! 1 p ligand-centered fluorescence together with dual visible Er( 4 S 3/2 !…”