Synthesis and photoluminescence characteristics of (Y,Gd)BO₃:RE (RE = Eu³⁺, Ce³⁺, Dy³⁺ and Tb³⁺) phosphors for blue chip and near‐UV white LEDs

Abstract

A series of Eu(3+)-, Ce(3+)-, Dy(3+)- and Tb(3+)-doped (Y,Gd)BO3 phosphors was synthesized by a solid-state diffusion method. X-Ray diffraction confirmed their hexagonal structure and the scanning electron microscopy results showed crystalline particles. The excitation spectra revealed that (Y,Gd)BO3 phosphors doped with Eu(3+), Ce(3+), Dy(3+) and Tb(3+) are effectively excited with near UV-light of 395 nm/blue light, 364, 351 and 314 nm, respectively. Photoluminescence spectra of Eu(3+)-, Ce(3+)- and Tb(3+)/Dy(3+)-doped phosphor showed intense emission of reddish orange, blue and white light, respectively. The phosphor Y0.60Gd0.38BO3:Ce0.02 showed CIE 1931 color coordinates of (0.158, 0.031) and better color purity compared with commercially available blue BAM:Eu(2+) phosphor. The phosphor (Y,Gd)BO3 doped with Eu(3+), Dy(3+) and Tb(3+) showed CIE 1931 color coordinates of (0.667, 0.332), (0.251, 0.299) and (0.333, 0.391) respectively. Significant photoluminescence characteristics of the prepared phosphors indicate that they might serve as potential candidates for blue chip and near-UV white light-emitting diode applications.

Photoluminescence and Energy Transfer Study of Sr3Y0.96(BO3)3:0.02Ce3+0.02Mn2+ Phosphor for WLED Application

“…Powder samples of Sr 3 Y(BO 3 ) 3 , Sr 3 Y 0.98 (BO 3 ) 3 : 0.02 Ce 3+ , Sr 3 Y 1‐ x (BO 3 ) 3 : x Mn 2+ ( x = 0.02, 0.03, 0.04, 0.05) and Sr 3 Y 0.96 (BO 3 ) 3 : 0.02 Ce 3+ 0.02 Mn 2+ were synthesized by a solution combustion method. [ 5 ] The precursors, strontium nitrate [Sr(NO 3 ) 2 ], boric acid [H 3 BO 3 ], cerium nitrate [CeN 3 O 9 6H 2 O], yttrium oxide [Y 2 O 3 ], urea [NH 2 CONH 2 ], manganese nitrate[Mn(NO 3 ) 2 (H 2 O) n ] all in analytical purity form were used. In this preparation, nitrates were used as an oxidizer and NH 2 CONH 2 was used as a fuel.…”

“…[1,2] Manganese (Mn) is a pinkish-gray element, exists naturally within the surroundings and has chemically active nature. Manganese ions have d 5 configuration and exist in different valence states (+2, +3, +4, +6, and +7) where as Mn 2+ is the most stable oxidation state of manganese. Mn 2+ ion is a well-known paramagnetic ion and plays an important role DOI: 10.1002/masy.202000011 as luminescence activator in several inorganic phosphors.…”

“…0.02 Mn 2+ were synthesized by a solution combustion method. [5] ] all in analytical purity form were used. In this preparation, nitrates were used as an oxidizer and NH 2 CONH 2 was used as a fuel.…”

Blue Luminescent Phosphor Sr3Y1−X(BO3)3:XBi3+ for WLED Applications

“…Solid state white LED lamps are costly due to the cost of UV LED chips used in the lamp for excitation of RGB phosphor coated on it. Use of blue chips can significantly reduce the cost and also increase the efficiency of LED lamp to large extent . So, we decided to synthesize the blue emitting phosphor.…”

Crystal structure and luminescence properties of the blue‐green‐emitting Ba9(Lu, Y)2Si6O24:Ce3+ phosphor

“…These drawbacks meant that YAG:Ce 3 + failed to meet indoor lighting requirements that prefer a warm white light with a low CCT (<4000 K) and a high CRI (>80). As an alternative scheme, the combination of a near‐ultraviolet (NUV) LED chip and three‐primary color (red, green, and blue) phosphors can generate an ideal white light with a high CRI and a tunable CCT . In addition, the color of NUV‐based WLEDs is only decided by phosphors, which circumvent the color drift under a fluctuation of working current.…”