Study of photophosphors for white LEDs

Цветкова М.Н., Черновец Б.В., Иткинсон Г.В., Корсаков В.Г., Сычев М.М. Исследование фотолюминофоров для светодиодов белого цвета свечения // Оптический журнал. 2011. Т. 78. № 6. С. 75–80.

Tsvetkova M.N., Chernovets B.V., Itkinson G.V., Korsakov V.G., Sychev M.M. Study of photophosphors for white LEDs [in Russian] // Opticheskii Zhurnal. 2011. V. 78. № 6. P. 75–80.

M. N. Tsvetkova, B. V. Chernovets, G. V. Itkinson, V. G. Korsakov, and M. M. Sychev, "Study of photophosphors for white LEDs," Journal of Optical Technology. 78(6), 403-407 (2011). https://doi.org/10.1364/JOT.78.000403

A comparative study has been carried out of the composition and the reflection and luminescence spectra of yttrium aluminum garnet and sialons as promising photophosphors. It is shown that the phase composition and surface inhomogeneity of the sialon particles has no effect on the position of the dopant levels in the band gap of the matrix or the photoluminescence spectra. It is established that the quantum efficiency of photophosphors synthesized on a sialon base and doped with europium is comparable with that of the garnet phosphor Y3Al5O12:Ce, and this makes it possible to use them in producing LEDs with white luminescence. The strength of the crystalline structure of sialons is significantly higher, and therefore the brightness and luminescence color of the photophosphors shows little dependence on time and temperature.

The authors are thankful to Evstrapov A.A. for help in experimental set up and discussion.

The research was partly financed by the Federal Target Program "Scientific and Academic Staff of Innovative Russia" (П-685, П-1221).