Amplified Spontaneous Emission in Paper

Abstract

Industrially produced copy paper is presented as a novel optical material for narrow-band stimulated emission. Fluorescent brightening agents (FBA) such as Calcofluor White provide enough gain to exceed the threshold for amplified spontaneous emission. By applying an additional dye such as Coumarin 307, or simply a highlighter pen, the emission line can be shifted from blue (~440 nm), towards turquoise (>480 nm), up to orange (590 nm) which can be useful for spectroscopic applications. These properties are demonstrated in two papers, a commercial copy paper and a FBA-stained calligraphy paper.

Light Amplification Materials Based on Biopolymers Doped with Dye Molecules—Structural Insights from 15N and 13C Solid-State Dynamic Nuclear Polarization

“…As a first model system, the calligraphic paper, which was doped with Calcofluor White (sample 3 ), was investigated. This model system has been successfully applied previously in ASE experiments . To study the interaction of the dye molecule with the paper material in this model system, three different samples were prepared and inspected by DNP-enhanced 13 C and 1 H → 15 N CP MAS solid-state NMR, namely, the pure Calcofluor White dye (sample 1a ) as well as the pure calligraphic paper (sample 2a ) as references, and the calligraphic paper doped with Calcofluor White (sample 3a ).…”

“…In the past decades, paper substrates as well as chitosan and their derivatives have become the basis for a large variety of biocompatible functional materials with potential applications in different fields such as in food industry, drug delivery systems, or medical diagnostics. − More specific applications range from supporting materials for catalysts , and stimuli-responsive or sensoric molecules , over electronic and optical devices , to materials that have been recently used in amplified light emission experiments. , To make paper substrates or chitosan available, they have to be prepared from natural, renewable resources. For paper materials, typically cellulose fibers from plants are the basis for manufacturing .…”

“…As recently demonstrated by some of us, conventional paper substrates can be simply treated with a fluorescent brightening agent (FBA) such as Calcofluor White and efficiently applied in amplified spontaneous emission (ASE) experiments. In this content, however, the following questions are still open: (i) How does the dye molecule interact with the supporting material.…”

Uncovering candidate genes involved in photosynthetic capacity using unexplored genetic variation in Spring Wheat

“…tauschii was observed to be as high as 43% of the D genome with an average of 16% across the synthetic‐derived subpopulation (Table S4 ). Contribution of synthetic material to advanced lines has been theoretically predicted utilizing genetic inference from pedigree history and allele frequency variation of markers at low resolution, determining a likely average of 17.5% contribution (Rosyara et al, 2019 ). Here we are able to confirm these predictions and build on this by identifying regions to high resolution and through SNP identity utilizing the Ae.…”

“…squarrosa ) D genome donors (Das et al, 2016 ; Jafarzadeh et al, 2016 ). Many have been used as parents in pre‐breeding and breeding programmes, being crossed with elite material producing synthetic‐derived lines (Li et al, 2018 ; Rosyara et al, 2019 ). These lines are attributed to have favourable effects on yield under irrigated conditions (Manès et al, 2012 ), drought stress (Lopes and Reynolds, 2011 ), heat stress (Cossani and Reynolds, 2015 ), salinity (Colmer et al, 2006 ), biofortification (Velu et al, 2018 ), pre‐harvest sprouting resistance (Imtiaz et al, 2008 ) and resistance to several pests and diseases (Kishii, 2019 ).…”