Multicolor luminescence evolving from single-phase Eu3+/Tb3+ co-doped SrLaAlO4 nanomaterials for advanced photonic appliances

Green emission from trivalent cerium doped LaAlO3/MgO nano-composite for photonic and latent finger printing applications

“…The energy transfer efficiencies ( η T ) and probabilities ( P ) expressed by the (10) and (11) belowwhere, τ s and τ s 0 are the estimated lifetimes of phosphor with and without Ce 3+ ions. 3,54 The estimated values as mentioned in Table 3 show the rise in both the parameters as the activator concentration goes on increasing. Such trend of decreasing τ and increasing η T , P with increasing activator content can be attributed to energy transfer between Ce 3+ –Ce 3+ ions.…”

“…where, R h and R d are ionic radii of host and dopant ions respectively for their corresponding coordination numbers (CN) 3 . In the present study, calculated values of Dr for substitution of Al 3+ (r = 0.5375 Å, CN = 6) and La 3+ (r = 1.36 Å, CN = 12) by Ce 3+ (r = 1.01 Å, CN = 6; r = 1.34 Å, CN = 12) are 87.90% and 1.47% respectively.…”

“…1,2 Current mainstream patterns of developing w-LEDs involve either the encapsulation of blue LEDs with yellow emitting phosphor YAG:Ce 3+ or pumping trichromatic blue, green, red (BRG) phosphors with UV light. 3,4 However, the rst strategy suffers due to high CCT, low color rendering index (R a < 80), halo-effect, thermal quenching, etc. In the later category, the commercially used tricolor phosphor materials are BaMgAl 10 O 17 :Eu 2+ for blue, ZnS:(Cu + , Al + ) for green and Y 2 O 2 S:Eu 3+ for red emission.…”