Disclosure of defects in YAG crystals by the thermoluminescence method

Niklas, A.

doi:10.1007/bf00617175

Cited by 3 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Despite this approach providing good laser quality material there is still evidence for facets and growth striations. These are always major problems in growing YAG crystals, and are the main cause of impurity segregation and point defects in YAG [15][16][17][18]. Excitation and spectral measurements were carried out on a high sensitivity wavelength multiplexed system with temperature control either from 20 to 300 K, or above room temperature from 20 to 400 • C. The equipment has in situ facilities for both electron and x-ray radiation, and so can be used for conventional CL and RL at a fixed temperature.…”

Section: Methodsmentioning

confidence: 99%

Low temperature luminescence from the near surface region of Nd:YAG

Maghrabi

Townsend

Vázquez

2001

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Luminescence offers a sensitive probe of the quality of Nd:YAG laser material both in the bulk and, via cathodoluminescence, in the near surface layers. The spectral signals are primarily from the Nd dopants, but the thermoluminescence spectra reveal traces of impurities such as Tb, Cr and Mn. Control of the electron energy of the cathodoluminescence demonstrates that the outer few micron layers differ significantly in luminescence response from the bulk crystal. The cathodoluminescence signals are influenced by near surface dislocations and solvents from cleaning treatments. The effects are often apparent as discontinuities in the Nd signal intensities at temperatures which match the solid-liquid or liquid-gas phase transitions of contaminants. Additionally there is strong evidence for the inclusion of carbon dioxide, in the form of nanoparticles. At 202 K, the CO2 sublimation temperature, the Nd line intensities change discretely and there are wavelength shifts for some of the emission lines consistent with pressure driven changes in the lattice parameter. Data for x-ray lattice parameters identify a complex and sudden change and expansion of the lattice in this temperature region. The luminescence methods used suggest identification of impurities and gaseous inclusions can be exploited in other insulator materials and examples are cited.

show abstract

Section: Methodsmentioning

confidence: 99%

Low temperature luminescence from the near surface region of Nd:YAG

Maghrabi

Townsend

Vázquez

2001

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…The Tb singly-doped YAG shows two TL glow peaks at 410 and 600 K, which have been observed previously and attributed to traps related to intrinsic defects containing oxygen vacancy, cation vacancy and anti-site Y Al in YAG. [25][26][27] Surprisingly, adding Eu to YAG:Tb enables creation of two strong high-temperature TL glow peaks at 693 and 765 K, labeled as trap 3 and trap 4, respectively. Moreover, the 600 K TL glow peak (labeled as trap 2) is substantially enhanced and the 410 K peak (trap 1) is slightly enhanced.…”

Section: Eu Induced Deep Trapsmentioning

confidence: 99%

Creating Deep Traps in Yttrium Aluminum Garnet for Long‐Term Optical Storage and Afterglow‐Intensity‐Ratio‐Based Temperature Sensing

Liao,

Liu,

et al. 2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

Deep traps are needed for electron‐trapping‐based long‐term optical storage due to its resistance to thermal erasure. Current electron trapping materials have the erasing temperatures hardly beyond 600 K, limiting its storage time. Herein, an electron trapping material containing deep traps is achieved by co‐doping Tb and Eu in Y3Al5O12 via solid‐state reaction in reducing atmosphere. After 254 nm UV charging, strong thermoluminescence of Tb3+ with the glow curve peaking at 600, 693, and 765 K is observed. The comparative studies of the as‐made and the air‐annealed samples suggest that these new traps are related to the complex defects containing oxygen vacancy with adjacent Eu2+ and the charging process is the photoionization of Tb3+ with subsequent electron trapping. The 693 and 765 K thermoluminescence glow peaks in the charged sample show almost no decrease during 108 h storage in dark at room temperature. Images write‐in and read‐out via 808 nm laser stimulation are realized. Furthermore, the present phosphor also exhibits temperature‐sensitive afterglow spectra in the range of 553–803 K with the sensing span of 250 K wider than other afterglow thermometers. These findings indicate the great application potentials of Y3Al5O12:Tb,Eu phosphor in long‐term optical storage and temperature sensing.

show abstract

“…Согласно литера-турным данным [1-3], к числу наиболее устойчивых соединений, на базе которых можно создавать различные люминесцентные ма-териалы, относятся алюминаты редкоземельных элементов со структурой граната, поскольку они обладают высокой химиче-ской и радиационной стойкостью, хорошими механическими, опти-ческими и тепловыми свойствами. Изучению монокристаллических и керамических люминофоров на основе алюмоиттриевого граната, активированного ионами иттер-бия, способного преобразовывать энергию в ближнем ИК−диапазоне длин волн, посвящены работы [2][3][4][5][6][7][8][9][10][11]. Однако до настоящего времени практически не проводили иссле-дований образцов полидисперсных люминофоров на основе алюмоитт-риевого граната, активированного ионами иттербия.…”

Section: Introductionunclassified

“…Для формирования доменных структур сегодня можно исполь-зовать как ростовые [8][9][10], так и послеростовые методы [11][12][13][14]. Наибольший интерес представля-ют послеростовые методы форми-рования доменных структур, с по-мощью которых, используя методы прямой электронно−лучевой пере-поляризации или атомно−силовой микроскопии, можно формировать доменные структуры с шириной доменов менее 1 мкм.…”

Section: Introductionunclassified