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104 Handbook on the Physics and Chemistry of Rare Earths conditions, at $1600°C and under a pressure of $0.9 MPa in nitrogen atmo- sphere. A very recent improvement is the successful synthesis of SrLiAl3N4: Eu2+ (Pust et al., 2014b) at only 1000°C and under ambient pressure. There is hope that this unique example will be followed by others since less strin- gent (and simpler) synthetic conditions are urgently desired for nitride phosphors. Several new concepts for materials design of phosphors and smart ideas for synthesis routes have been proposed in the past decade. Some of them may grow to a key technology in the coming decades for realizing much higher efficiency and lower cost materials. Nobody may have objection against the final goal, the overwhelming replacement of incandescent lamps and fluorescent lamps by white LEDs. Further efforts must be made to realize this goal. While writing this review on November, 2014, the Royal Swedish Academy of Sciences announced that the Nobel Prize in Physics 2014 was awarded jointly to Isamu Akasaki, Hiroshi Amano and Shuji Nakamura, for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources. It should be again noteworthy that the role of rare earth ions, especially Ce3+ which emits a complementary color (yel- low) of blue light, has central contribution to the development of white LEDs. ACRONYMS AND ABBREVIATIONS BOS (Ba,Sr)2SiO4:Eu2 + CA citric acid CASN CaAlSiN3:Eu2 + CCT correlated color temperature CIE Commission Internationale de l’Eclairage COB chip-on-board CRI color rendering index EPD electrophoretic deposition FED field emission display FWHM full width at half maximum HAST highly accelerated stress test ICSD inorganic crystal structure database LED light-emitting diode LER luminous efficacy of radiation NTSC National Television System Committee PET polyethylene terephthalate PG propylene glycol PGMS propylene glycol-modified silane RG red–green RGB red–green–bluePDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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