Green upconversion continuous wave Er3+:LiYF4 laser at room temperature

Abstract

We report room-temperature upconversion pumped continuous wave laser emission of 1% Er3+:LiYF4 at 551 nm excited by a Ti:sapphire laser at 810 nm. Output powers of up to 40 mW with output coupling of 6.6% have been obtained by using nearly concentric resonator design.

Blue upconversion luminescence of CaMoO4:Li+/Yb3+/Tm3+ phosphors prepared by complex citrate method

“…The lanthanide ions such as Er 3+ , Tm 3+ and Ho 3+ have been used as luminescence centers because they have their abundant energy levels for radiative transition, some of which are suitable for direct pumping by NIR (∼980-nm) laser diode [3,4]. The wide applications of upconversion phosphors include three-dimensional displays like flat panel display [5], solid state lasers [6] and solar cell [7]. Currently, these materials can be used for medical diagnostics and nano-biotechnology such as bio labeling, bioimaging [8,9].…”

Single‐Band Upconversion Emission in Lanthanide‐Doped KMnF3 Nanocrystals

“…[1][2][3][4] In particular, there has been an increasing focus on the synthesis of nanocrystals with tunable UC emission from ultraviolet to near-infrared through doping with lanthanide ions. [5] However, the synthesis of nanocrystals featuring single-band UC with high chromatic purity remains a formidable challenge, as lanthanide ions generally have more than one metastable excited state. [6] In principle, these lanthanide-doped nanocrystals display multipeak emission profiles.…”

The kinetic limitation of anti-stokes luminescence of Er3+ and Yb3+ doped infrared upconversion materials

“…Then the concentration ratio of the excited state is determined from the simple expression AE ½ AE Ë È ¼½ È ½¼ Ë for any excitation process [14]. The general equation of balance for the dissipative transition in the system is obtained by combining eqs (1), (2) and (3). Thus, we get AE ½ ½ · ¾ AE ¾ £ ¾ · AE ¾ · AE Ë Ë ´ Ë Ë · µ Á (12) For this case the quantum yield of anti-Stokes luminescence may be given by…”

“…The wave-length conversion methods include employing optical nonlinear materials [1] and excited state absorption [2]. Infrared upconversion by means of sequential excitation in Yb ¿· sensitized materials, often called anti-Stokes luminescence or energy transfer upconversion (ETU) or addition of photons by transfer of energy (APTE), is known to present a convenient method for realizing both coherent and incoherent upconversion devices [3][4].…”