12CaO.7Al Ceramic: A Review of the Electronic and Optoelectronic Applications in Display Devices

Abstract

The alumina-based compound, 12CaO.7Al O , is a ceramic material with a unique cage-like lattice. Such a structure has enabled scientists to extract various new characteristics from this compound, most of which were unknown until quite recently. This compound has the ability to incorporate different anionic species and even electrons to the empty space inside its cages, thereby changing from an insulator into a conductive oxide. The cage walls can also incorporate different rare earth phosphor elements producing an oxide-based phosphor. All these characteristics are obtained without a significant change in the structure of the lattice. It is, therefore, reasonable to expect that this compound will receive attention as a potential material for display applications. This review article presents recent investigations into the application of 12CaO.7Al O ceramic in various display devices, the challenges, opportunities and possible areas of future investigation into the development of this naturally abundant and environmental friendly material in the field of display.

Tuning the work function of graphene toward application as anode and cathode

“…It is not a minor subject, as shown by the different WF values of materials in the literature. An example is the C12A7:e - [30], one of the most promising electrodes due to its extraordinary stability and low WF [31]. Using data from field-emission and thermionic-emission characteristics, [35].…”

Optical and Scintillation Properties of Rare-Earth Ion-Doped 12CaO·7Al2O3 Single Crystals

“…C12A7 is one of the components of cement. (6) In the unit cell of C12A7, there are 12 cages with an inner diameter of ~0.4 nm and two different cages hosting extra-framework oxygen ions. (7) For its wide-band-gap energy of 6.0 eV, (8) it is transparent in the near-UV and visible ranges, and it has been studied for use in optical devices including conductor devices and transparent displays.…”

“…(7) For its wide-band-gap energy of 6.0 eV, (8) it is transparent in the near-UV and visible ranges, and it has been studied for use in optical devices including conductor devices and transparent displays. (6)(7)(8)(9) In addition, C12A7…”

“…Until now, photoluminescence (PL) properties of undoped C12A7 (10) were reported and RE:C12A7 was also studied in several different material forms: ceramics, (11)(12)(13)(14) powders (15,16) and single crystals. (6,17) For radiation detection applications, the thermally stimulated luminescence of Tb-doped C12A7 ceramics and powder forms was also reported; (18) however, no studies can be found for scintillator applications of undoped and RE:C12A7 single crystals.…”

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

“…C12A7 research has prompted reviews spanning thermodynamics and synthesis [42], single crystal and thin film growth and the associated electrical properties [2,43], structural disorder and compositional analogs based on the mineral mayenite supergroup [44], and applications in display devices [45]. The goal of this review is to consolidate the structure-physical property relationships, illuminate discrepancies due to the complicated nature of the compound, suggest areas for future research, and investigate the effects of cation doping into the C12A7 clathrate cage framework.…”