Solid-state Optical Materials and Luminescence Properties: Processing and Study of Advanced Optical Materials II
Sponsored by: ACerS Basic Science Division
Program Organizers: Yiquan Wu, Alfred University; Jas Sanghera, Naval Research Laboratory; Akio Ikesue, World-Lab. Co., Ltd; Rong-Jun Xie, Xiamen University; Mathieu Allix, Laboratoire CEMHTI; Kiyoshi Shimamura, National Institute for Materials Science; Liangbi Su, Shanghai Institute of Ceramics; Dariusz Hreniak, Institute of Low Temperature and Structure Research
Monday 2:00 PM
October 10, 2022
Room: 409
Location: David L. Lawrence Convention Center
Session Chair: Guangran Zhang , Corning Incorporated
2:00 PM Invited
High-entropy Rare-earth Aluminates: Crystal Growth and Ceramics: Mariya Zhuravleva1; Kaden Anderson1; Matheus Pianassola1; Charles Melcher1; Yimin Wang2; Jaroslaw Glodo2; 1University of Tennessee; 2Radiation Monitoring Devices, Inc.
We explore a new concept in design of single crystal and polycrystalline ceramic scintillators for high-energy X-ray radiography. They are based on multi-component aluminum garnets which are solid solutions of several rare-earth elements taken in equiatomic proportions. We successfully grew single crystals via the micro-pulling down technique and used wet chemistry synthesis to produce powders that were subsequently hot pressed to produce high density bulk ceramics. The effect of the average ionic radii on phase formation, and optical and scintillation properties were investigated.
2:20 PM Invited
UVC and UVB Dual-band Persistent Luminescent Phosphor: Yuanbing Mao1; Xianli Wang1; 1Illinois Institute of Technology
While persistent luminescence (PersL) at visible and infrared are frequently reported in lanthanide-doped phosphors, ultraviolet PersL remains much less. Here, we have designed Pr3+-doped (Ca1.5Y1.5)(Al3.5Si1.5)O12 (CYAS-Pr) through co-substituting Ca2+-Si4+ into a well-known garnet structure, Y3Al5O12. By the strategy of Ca2+-Si4+ co-substitution, the CYAS-Pr exhibits lattice distortion and subsequently an unprecedent UVC and UVB dual-band PersL with maxima at 266 and 311 nm for 12 hours after charged by UV irradiation due to creation of intrinsic trapping centers. The unique PersL performance is contributed by an existence of two different Pr3+ environments at Ca2+ and Y3+ sites of the CYAS host. The CYAS-Pr shows efficient dual information storage and precise long-distance self-sustained “solar-blind” imaging capabilities in a wide and bright field of view. It is expected that the UVC and UVB dual-band PersL CYAS-Pr will find more applications and trigger further exploration towards persistent sterilization and persistent photocatalysis.
2:40 PM Invited
Optical Ceramic Window Materials at NRL: Woohong (Rick) Kim1; Shyam Bayya1; Colin Baker1; Brandon Shaw1; Lynda Busse1; Jesse Frantz1; Bryan Sadowski2; Tony Zhou3; Adam Floyd3; Joshua Gild3; Jasbinder Sanghera1; 1Naval Research Laboratory; 2Jacobs; 3University Research Foundation
We report our recent progress in the development of high quality transparent ceramic materials. There are numerous applications operating in very harsh environments that require rugged windows. MgAl2O4 spinel and sesquioxides are excellent candidates for these applications due to their high mechanical strength, wide transmission range, and isotropic structure. Here, we provide an update of the results of the synthesis, scale up process, and applications of ultra-high purity spinel, undoped/RE-doped Sesquioxides, and non-oxide ceramics such as beta-SiC developed for mid-IR ceramic window material for an extreme environment. Various densification methods used to fabricate high quality optical ceramics are also presented.
3:00 PM
Advanced Spinel Ceramics with Highest VUV-vis Transparency: Akio Ikesue1; 1World-Lab. Co., Ltd
Synthesis of optical grade spinel ceramics superior to commercially available single crystalspinel was successfully achieved through reactive sintering between high purity MgO and Al2O3 powders with a small amount of MgF2 and AlF3 as sintering aids. The average grain size of the fabricated spinel ceramics was approximately 20μm, with residual porosity at the 10-13 level. The transmission characteristics from the visible to infrared region of the spinel ceramics (optical loss: <0.1%/cm) are equal to or higher than those of the single crystal spinel produced by the Czochralski method. Since the optical homogeneity of the ceramics is extremely high, the beam quality of the laser transmitted through the material did not degrade. The optical band gaps of spinel ceramics and single crystals are 6.81eV and 5.51eV respectively. However, polycrystalline ceramics showed excellent characteristics especially in the vacuum ultraviolet wavelengths below 200 nm where single crystals are difficult to transmit.
3:20 PM Break
3:40 PM Invited
Yb Doped MgO Transparent Ceramics Sintered through the SPS Method: Guangran Zhang1; Xuan Chen1; Yiquan Wu1; Robert Tomala2; Dariusz Hreniak3; 1Alfred University; 2Polish Academy of Sciences ; 3Polish Academy of Sciences
Magnesium oxide (MgO) is a wide band-gap insulator (7.8 eV) with a rock salt crystal structure. When MgO is used as a laser host material, the thermal conductivity of MgO ceramics at room temperature is ~55 Wm-1K-1, a value much higher than that of YAG (~9 Wm-1K-1). However, the fabrication of MgO transparent ceramics is highly challenging because of the high melting point of MgO. In the present work, Yb doped (0, 0.02, 0.1 and 0.5 at.%) MgO transparent ceramics were synthesized through spark plasma sintering (SPS) at the relatively low temperature of 1100°C for 5–60 min under a pressure of 105 MPa. The effects of dopant concentration and sintering holding time on the densification and microstructure evolution of MgO ceramics were investigated. The influence of Yb doping on the crystalline phase and microstructure was explored, and the photoluminescence properties of Yb in transparent MgO ceramics were investigated.
4:00 PM
Application of La2Zr2O7:Pr3+ Nanoparticles for Luminescence Thermometry: Forough Jahanbazi1; Yuanbing Mao1; 1Illinois Institute of Technology
Luminescence thermometry has become fascinating owing to its applicability in chemically and electromagnetically harsh environments. A wide temperature sensing range is required for luminescent thermometric materials. Herein, we have demonstrated that pyrochlore La2Zr2O7:Pr3+ nanoparticles can serve as a promising optical temperature sensing material over a wide temperature range. Specifically, we have taken advantage of the intervalence charge transfer state of Pr3+ doping ion for luminescence temperature sensing and confirmed excellent optical thermometric performance from these nanoparticles in a temperature sensing range of 85-705 K. The thermal sensing was measured by exploiting one thermometric parameter, i.e. the fluorescence intensity ratio. A maximum relative sensitivity of > 0.4%·K−1 from 165 to 205 K and a low temperature uncertainty of 1.21 K at 185 K is obtained. This work provides a useful inspiration for exploring appropriate host materials with slow thermal-quenching channels to develop optical thermometric materials over a wide temperature sensing range.
4:20 PM
Manipulable Persistent Luminescence of Pr3+-Activated Phosphors: Yuanbing Mao1; Xianli Wang1; 1Illinois Institute of Technology
Remarkable progress has occurred in the development of persistent luminescent (PersL) materials owing to their unique “self-luminescing” feature and broad potential applications. Pr3+ is one PersL emitter which could cover the full spectral range from ultraviolet to infrared due to its manipulable 4f5d → 4f2 inter-configurational and 4f2 → 4f2 intra-configurational transitions in appropriately designed hosts. Here, we reviewed the advancements in Pr3+-activated PersL phosphors to provide some guidelines for design new PersL phosphors. The advancement and plausible mechanisms of Pr3+-activated visible and infrared PersL phosphors were discussed as “self-luminescing” probes in night-vision surveillance and bio-imaging. The more recently reported UV PersL phosphors activated by Pr3+ have boosted new exciting applications such as “solar-blind” imaging. The perspectives for Pr3+-activated persistent phosphors are addressed. This review is expected to further motivate development of high-performance persistent phosphors regarding their potential applications along with understanding their composition–structure–property relationship.