Ligand‐Driven Wavelength‐Tunable and Ultra‐Broadband Infrared Luminescence in Single‐Ion‐Doped Transparent Hybrid Materials

Abstract

Here, tuning of the optical properties of emission centers by tailoring the ligand fields is investigated. Experimentally, it is demonstrated that Ni2+ can act as a single emission species in multiple octahedral local environments. Nanocrystal‐embedded hybrid materials are employed as hosts in order to take advantage of their convenience in local environment design for practical applications. Novel composite gain materials with high transparence are successfully made, and show interesting wavelength‐tunable and ultra‐broadband infrared luminescence covering the whole near‐infrared region from 1 100 to 1 800 nm. The infrared luminescence peak positions can be finely tuned from 1 300 to 1 450 and to 1 570 nm, with the largest full width at half maximum being about 400 nm and covering the telecommunication bands at 1 200–1 500 nm. According to the results of characterization, the unusual luminescence, interestingly, originates from Ni2+ in nanocrystals and the doping efficiency of Ni2+ is surprisingly high. The results demonstrate that the method presented may be an effective way to fabricate multifunctional light sources with various fundamental multifunctional applications from efficient broadband optical amplifiers to bio‐imaging.

Tailoring of the trap distribution and crystal field in Cr3+-doped non-gallate phosphors with near-infrared long-persistence phosphorescence

“…The crystal field parameters of Cr 3+ ions in Zn 2-x Al 2x Sn 1-x O 4 phosphors are calculated and presented in Table 2 and demonstrating an increase in crystal field strength, with the help of the Tanabe-Sugano matrix. 40 The relatively precise crystal field strength Dq and the Racah parameters B can be estimated by spectroscopic data as follows: 17 Figure S2). By shortening the Cr 3+ -O 2-distances, achieved by the incorporation of Al 3+ (53 pm) with its smaller ionic radii compared with Zn 2+ (74 pm) and Sn 4+ (69 pm), the crystal field strength of Cr 3+ increases.…”

Multifunctional tunable ultra-broadband visible and near-infrared luminescence from bismuth-doped germanate glasses

“…57 Thus, we designed MgO-Al 2 O 3 -GeO 2 glass system as the host matrix. At present, tunable luminescence has been realized by many methods in rare-earth ions and transition metal ions doped materials; however, most of the methods were realized by changing ligang field in terms of modifying the host composition, 58 by controlling the energy transfer and luminescene intensity of several different dopants ions in terms of tailoring the distribution and concentration of these dopants ions. [59][60][61] Here, based on our supposition about the co-existence and different properties of several NIR bismuth active centers, we present three simple but efficient approaches to realize ultra-broadband controllable NIR luminescence covering 1000 to 1700 nm in the same glass host with only one dopant via modulating bismuth concentration, melting temperature, and atmosphere.…”

Glass-ceramics for photonic devices

“…15) However, the optical properties of such material can still be improved. We carried out a series of experiments, and proved that the optical properties of Ni 2+ ions doped GCs can be optimized through control of nanocrystal size; 22) tailoring of the local ligand field around the active center; 25) and co-doped with TM ions (Cr 3+ ions) 27) and RE ions (Yb 3+ ions).…”

“…39)41) We firstly reported the design and successful fabrication of NIR luminescent nanostructured materials with tunable and ultra-broadband luminescent characteristics by using only one isolated center® Ni 2+ . 25) A thorough knowledge of the distribution characteristics of various energy levels is of key importance in controlling the electron transitions between them. According to the Tanabe …”