Near infrared photoluminescence of the univalent bismuth impurity center in leucite and pollucite crystal hosts

Abstract

aThe bismuth doped aluminosilicate phases leucite (KAlSi 2 O 6 ), gallium leucite (KGaSi 2 O 6 ) and pollucite (CsAlSi 2 O 6 ) display broadband NIR photoluminescence. The active center, responsible for this luminescence, is the Bi + monocation, which substitutes for the large alkali metal cations. The Al,Si-disorder in the aluminosilicate framework of studied crystal phases results in the heterogeneity of Bi + luminescent center population, which manifests itself in the characteristic dependency of the luminescence spectrum shape on the excitation wavelength. The relation of NIR emission in Bi + -doped leucite and pollucite phases to the luminescent properties of bismuth-doped glasses is also discussed.

NIR photoluminescence of bismuth-doped CsCdBr3 – The first ternary bromide phase with a univalent bismuth impurity center

“…We adopt here, that two bands in the visible range of the absorption spectrum and in the luminescence excitation spectrum of Bi + -doped ternary halides result from the excitation to the sublevels of crystal-field splitted 3 P 2 state, while the PL is the result of radiative transitions from the sublevels of the 3 P 1 state to the 3 P 0 ground state [9,11,26].…”

“…It was shown that several of such subvalent bismuth forms (Bi + [4][5][6][7][8][9][10][11], Bi 5 3+ [12][13][14][15][16], Bi 2 8+ [16]) demonstrate the broadband NIR PL.…”

“…Univalent bismuth impurity, observed in several chloride [6][7][8][9][10], iodide [18,19] and nonhalide crystal phases [11,[20][21][22][23][24][25], represents the simplest form of NIR photoluminescent subvalent bismuth center. It possesses the 6p 2 open shell electronic configuration with the 3 P 0 ground state and 3 P 1 , 3 P 2 low lying excited states.…”

Crystallization kinetics and enhanced Bi NIR luminescence of transparent silicate glass‐ceramics containing Sr2YbF7 nanocrystals

“…We noticed in both glass and glass-ceramics samples bismuth NIR emission centers can be stabilized. They show typical absorptions and extremely broad luminescence which spans from 1100 to 1600 nm [3][4][5][6][34][35][36] with full width at half maximum of~300 nm (see Figures 2 and 5). exhibit similar luminescence feature.…”

A Soft Chemistry‐Based Route to Near‐Infrared Luminescent Bismuth‐Activated Glass Films

“…1 These materials have received extensive attention as a result of their peculiar characteristics including ultrabroad and long-lived photoluminescence (PL) covering the telecommunication and optimal biological optical windows, high emission quantum efficiency, and host-dependent spectral line shape. 1 Up to date, NIR PL has been observed in diverse classes of bismuth-activated materials such as glasses, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] conventional crystals, [16][17][18][19][20][21][22][23][24][25][26] molecular crystals, [27][28][29][30] ionic liquids, 31 and amorphous nanoparticles. 32 The use of these materials as optical gain media or biomarkers has been witnessed by functional demonstrations for optical fiber amplifiers, fiber lasers, and bioimaging.…”