White-light-emitting properties of SrTiO₃:Pr³⁺ nanoparticles

Abstract

Single-phase SrTiO 3 :mPr 3+ (m ¼ 0.01-0.1) nanoparticles have been synthesized by a hydrothermal method.Different from reported Pr 3+ -based phosphors which were all dominated by red emissions, considerably strong and overwhelming blue-green emission centered at 491 nm has been achieved together with minor green and red emissions. The absolute and relative intensities of these emissions can be modified by Pr 3+ concentrations and annealing temperatures in a controlled manner, giving rise to varied emission colors. In particular, owing to the appropriate combination of the blue to red emissions, desirable whitelight emission has been realized from the as-grown SrTiO 3 :0.01Pr 3+ and the annealed SrTiO 3 :0.06Pr 3+ samples at 350 C with CIE chromaticity coordinates of (0.33, 0.35) and (0.35, 0.37) and a correlated color temperature of 5601 K and 4883 K, respectively, indicating the promising application potential of SrTiO 3 :Pr 3+ as single-phase phosphors for white light-emitting-diodes. This work may provide a fresh route to acquire white emission from a single-composition phosphor. † Electronic supplementary information (ESI) available: Structural parameters of SrTiO 3 :mPr 3+ at room temperature rened with Pm3m space group, size distribution of the SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of the as-grown SrTiO 3 :0.06Pr 3+ monitored at 603 nm 617 nm and 650 nm, PL of the as-grown SrTiO 3 :0.06Pr 3+ sample under 447 nm excitation, SEM image of 1350 C annealed SrTiO 3 :0.06Pr 3+ nanoparticles, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 491 nm, PLE spectra of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples monitored at 617 nm, PL of the 1350 C annealed SrTiO 3 :0.06Pr 3+ sample under 490 nm excitation, CIE chromaticity diagram and chromaticity coordinates (x, y) of emission from SrTiO 3 :0.06Pr 3+ annealed at 1350 C (under 490 nm excitation), XRD patterns of as-grown and annealed SrTiO 3 :0.06Pr 3+ samples, structural parameters of as-grown and annealed SrTiO 3 :0.06Pr 3+ rened with Pm3m space group, and the energy level diagram of Pr 3+ ions. See

Influence of La substitution on local structural and photoluminescence properties of SrTiO3:Pr phosphor

“…Luminescent materials, or phosphors, typically consist of a host material and an activator and are widely used in optoelectronic devices, such as lasers, solar concentrators, vacuum fluorescent displays, medical radiology equipment (including scintillators), field emission displays and light-emitting diodes [1][2][3]. Host materials for phosphors include sulfides, metaloxides, oxy-halides and perovskites [2,[4][5][6].…”

“…Promising applications exist in the field of photonics as solid state lasers and optoelectronic devices [6]. Among luminescent materials with rare earth ion activators, Pr 3+ -doped inorganic materials are well known for their promising emission properties, in particular as red phosphors [1]. The three red emission lines arise from different origins of the 4f 2 -4f 2 transitions, i.e.…”

“…The three red emission lines arise from different origins of the 4f 2 -4f 2 transitions, i.e. 1 D 2 -3 H 4 (603 nm), 3 P 0 -3 H 6 (617 nm) and 3 P 0 -3 F 2 (650 nm), and occur in addition to two green emission lines ( 3 P 1 -3 H 5 (530 nm) and 3 P 0 -3 H 5 (547 nm))and one blue-green emission line ( 3 P 0 -3 H 4 (491 nm)) [1,7].…”

“…As can be seen, the photoluminescence curve of the SLPT5 sample shows blue ( 3 P 0,1,2 -3 H 4 ) and red ( 1 D 2 -3 H 4 and 3 P 0 -3 H 6 ) emissions with similar intensities. If the combination of the blue to red emissions can be regulated in a controlled manner, white emission from a single host may be realized, which can function as white light-emitting diodes (WLEDs) [1]. The spectrum of the SLPT10 sample shows an enhancement in the intensity of all emissions, mainly for 1 D 2 -3 H 4 and 3 P 0 -3 H 6 transitions.…”

Toward temperature‐dependent Bi3+‐related tunable emission in the YVO4:Bi3+ phosphor

“…Because of the vital role of phosphor in the pc‐wLEDs technology, a lot of UV‐ and blue‐converted phosphors that base on rare‐earth (RE; eg, Eu 2+ , Tb 3+ , Sm 3+ , Eu 3+ , Ce 3+ , Pr 3+ , etc) and non‐RE (eg, Bi 2+ , Mn 2+ , Mn 4+ , Bi 3+ , Cr 3+ , etc) ions doping are developed over the past years. Among these phosphors, RE‐doped phosphors exhibit a lot of sticky problems, for example, the limited absorption ability in UV/blue region (<10 nm; eg, Tb 3+ , Eu 3+ , Sm 3+ , Pr 3+ , etc) and the light reabsorption due to the broad excitation bands in the visible spectral region (eg, Eu 2+ , Ce 3+ , Dy 3+ , etc).…”