&lt;title&gt;Kind of electrovacuo glass in a YAG display tube&lt;/title&gt;

Cheng, Jianbo; Qi, Kangcheng; Wang, Qunhua; Wan, Jun

doi:10.1117/12.319681

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“…Yttrium Aluminum Garnet, Y 3 Al 5 O 12 (YAG) has been the subject of intense research efforts because of their wide use as detectors, laser host materials and phosphors [1][2][3][4][5][6][7]. In particular, a great deal of research has been conducted on doping and co-doping YAG with transition metals like Ce, Nd, Eu, Dy, Yb, Cr to investigate their effects on its optical properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Cerium-doped YAG (Ce: YAG) has received considerable attention because of its intense emission at 525 nm and its important role in converting blue emission to white light in InGaN light-emitting diodes [17][18][19][20].…”

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confidence: 99%

Physical and optical properties of Ce:YAG nanophosphors and transparent ceramics and observation of novel luminescence phenomenon

Agarwal

Haseman

Khamehchi

et al. 2017

Opt. Mater. Express

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Ce doped yttrium aluminum garnet (Ce:YAG) is an important photonic material that is used as a yellow phosphor for white light emitting diodes. In this work, the physical and optical properties of Ce:YAG nanophosphors are investigated and the effects of hightemperature thermal treatments and annealing atmospheres on the particle size and luminescence intensity are discussed. Furthermore, photo-luminescence (PL) was measured as a function of temperature and compared with PL from Ce:YAG single crystals and transparent ceramics to understand the mechanism of luminescence decay with temperature. While the characteristics of PL emission as a function of temperature for single crystals and NPs are similar and follow common decay trends, Ce:YAG transparent ceramics exhibit an interesting unusual increase in PL with temperature. We explained this unique novel behavior by a 4-step mechanism involving localized states in the band gap, and provided evidence from thermoluminescence measurements to support this interpretation. The work reveals a new luminescence phenomenon arising from the overlap of PL and TL emissions; this phenomenon is most likely characteristic of transparent ceramics.

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