A blue-emitting Eu²⁺-activated BaZnAl₁₀O₁₇phosphor for white light emitting diodes: structure and luminescence properties

Abstract

In the process of developing high-performance LCDs, narrow-band emitting phosphors with excellent performance are indispensable.

Non-concentration quenching and energy transfer enhanced green emission in Ca8SrGd(PO4)7:Eu2+,Tb3+ for near-UV white LEDs with a high color rendering index

“…On the basis of the Dexter's multipole interaction energy transfer formula and Reisfeld approximation, the following relationship is established to investigate the energy transfer mechanism: 41,42…”

“…The critical distance between the Eu and Tb ions can be calculated using the following formula: 41 where X c is the critical concentration, N is the number of available bits per unit cell, and V is the volume per unit cell. For Ca 8 SrGd(PO 4 ) 7 , N = 6, V = 3575.07.…”

“…On the basis of the Dexter's multipole interaction energy transfer formula and Reisfeld approximation, the following relationship is established to investigate the energy transfer mechanism: 41,42 where C is the doping amount of Tb 3+ ions, and n = 6, 8 and 10 correspond to dipole–dipole, dipole–quadrupole and quadrupole–quadrupole interactions, respectively. The best fit occurs when n = 8, indicating that the energy of the Eu 2+ ions transfers to the Tb 3+ ions through dipole–quadrupole interaction (Fig.…”

Novel color tunable LaCaGaO4:Bi3+,Eu3+ phosphors for high color rendering warm white LEDs

“…These w‐LEDs obtained in this way have the advantages of simplicity and low cost, but their disadvantages are also obvious. High correlated color temperatures (CCT) (>6000 K) and low R a (<70) caused by the absence of a red component in its emission do not meet the standards for health lighting, restricting the use of this technology in interior lighting, medical, and other industries 12–14 . Combining ultraviolet (UV) or near‐ultraviolet (n‐UV) chips with blue, green, and red trichromatic phosphors to produce white light is another technique with development potential.…”

“…High correlated color temperatures (CCT) (>6000 K) and low R a (<70) caused by the absence of a red component in its emission do not meet the standards for health lighting, restricting the use of this technology in interior lighting, medical, and other industries. [12][13][14] Combining ultraviolet (UV) or near-ultraviolet (n-UV) chips with blue, green, and red trichromatic phosphors to produce white light is another technique with development potential. It is feasible to perform luminescence color modulation and create w-LED devices with high R a and low CCT by varying the ratio of trichromatic phosphors.…”