Luminescence in cubic boron nitride doped by rare‐earth impurity

Abstract

We report shortly the observation of visible cathodoluminescence (CL) from micropowders of Eu-doped cubic boron nitride synthesized under high-pressure/high-temperature conditions and also annealed in a vacuum in the temperature range from 400 to 1100 °C. The multiplet of lines due to the intra-4f transitions on the Eu 3+ ion is detected in spectral region from 580 to 740 nm. The fact that the main line of the multiplet has the highest intensity, and the removed degeneracy of the 7 F 1 and 7 F 2 electronic levels represented by the second and third bands of the multiplet allow the conclusion that the red luminescence is due to the Eu 2 O 3 inclusions in the monoclinic form (probably, as nano particles) incorporated into the cBN grains.

Formation of flower-like MgO crystal and its effect on the photoluminescence of Mg-cBN ceramics

“…out binders, can be sintered within half hour or less. Recently, in a number of studies [20][21][22][23][24][25][26], some attempts have been made to investigate the luminescent properties of cBN ceramics and compacts doped or activated by rare earth elements, in order to develop visible light emitters and phosphors that can withstand extreme environmental conditions. It is known that beryllium is an effective p-type dopant for poly and single cBN crystals [19], however, there is a considerable safety issue due to its high toxicity and fast oxidation.…”

Eu‐doped Boron Nitride Nanotubes as a Nanometer‐Sized Visible‐Light Source

“…Peak II is most likely associated with the special bamboo structure, as the emission at the same energy range is observed from BN nanohorns, [22,23] which have a large number of bent BN layers and associated defects similar to the cup-shaped BN layers in the bamboo tubes. The broad low-energy emissions in the 500-600 nm range are often considered to be due to structural defects and the vacancies of B and N. [11,24] For Eu-doped nanotubes ( Fig. 5b and c), the spectra have a new strong band emission centered at around 490 nm in addition to the two intrinsic CL emission peaks.…”

Luminescence from europium, europium–chromium, erbium, samarium and terbium‐activated powder, ceramic and polycrystalline cubic boron nitride

“…(terbium) ions have been incorporated into high-pressure, high-temperature (HPHT) grown single crystals of relatively small dimensions [13], Eu, Gd and Ce-doped micropowders, ceramic and polycrystalline samples of cBN have been produced under high pressure conditions [14,15].…”