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YAl3(BO3)4: Tm3+/Ho3+nanophosphors for blue-LED applications

B. C. JAMALAIAH1,* , N. LALITHA RANI2, G. V. LOKESWARA REDDY3, D. V. RAGHU RAM4, T. SRINIVASA RAO5

Affiliation

  1. Department of Physics, Rajeev Gandhi Memorial College of Engineering and Technology (Autonomous), Nandyal 518501, Andhra Pradesh, India
  2. Department of Physics, Sri Krishnadevaraya University, Anantapur 515003, Andhra Pradesh, India
  3. Department of Physics, S.C.N.R. Government Degree College, Proddatur 516360, Andhra Pradesh, India
  4. Department of Physics, Hindu College, Guntur 522002, Andhra Pradesh, India
  5. Department of Physics, Jawahar Bharati Degree College, Kavali-524201, Andhra Pradesh, India

Abstract

The YAl3(BO3)4 nanophosphors activated with different concentrations of Tm3+/Ho3+ were synthesized by conventional solid-state reaction technique sintering at 1200 oC for 3 hours. Upon 359 nm near UV excitation, the YAl3(BO3)4:Tm3+/Ho3+ nanophosphors emit intense blue luminescence through Tm3+:1D2 → 3F4 (456 nm) and Tm3+:1G4 → 3H6 (481 nm) transitions. A quenching in luminescence was noticed beyond xTm3+/ yHo3+ (x = 1.0 mol% and y = 0.5 mol%) due to energy transfer at higher Tm3+ ions concentration through cross-relaxation mechanism. The experimental results show that the YAl3(BO3)4:xTm3+/yHo3+ (x = 1.0mol% and y = 0.5mol%) nanophosphors excited at 359 nm near UV radiation could be the best choice to develop blue-LEDs..

Keywords

Blue phosphors, Solid state reaction, Photoluminescence, LED applications.

Citation

B. C. JAMALAIAH, N. LALITHA RANI, G. V. LOKESWARA REDDY, D. V. RAGHU RAM, T. SRINIVASA RAO, YAl3(BO3)4: Tm3+/Ho3+nanophosphors for blue-LED applications, Optoelectronics and Advanced Materials - Rapid Communications, 13, 5-6, May-June 2019, pp.338-342 (2019).

Submitted at: Nov. 9, 2019

Accepted at: June 14, 2019